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Patent 2188390 Summary

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(12) Patent Application: (11) CA 2188390
(54) English Title: ELECTRICAL COOKING APPARATUS
(54) French Title: APPAREIL DE CUISSON ELECTRIQUE
Status: Deemed Abandoned and Beyond the Period of Reinstatement - Pending Response to Notice of Disregarded Communication
Bibliographic Data
(51) International Patent Classification (IPC):
  • H05B 1/02 (2006.01)
  • F24C 7/08 (2006.01)
  • H02J 3/14 (2006.01)
(72) Inventors :
  • YAHAV, SHIMON (Israel)
  • DAAR, YAIR (Israel)
(73) Owners :
  • BEZALEL PERELMUTER
  • LANCET S.A.
(71) Applicants :
  • BEZALEL PERELMUTER (United States of America)
  • LANCET S.A. (Panama)
(74) Agent: MARKS & CLERK
(74) Associate agent:
(45) Issued:
(86) PCT Filing Date: 1995-04-18
(87) Open to Public Inspection: 1995-11-02
Availability of licence: N/A
Dedicated to the Public: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): Yes
(86) PCT Filing Number: PCT/US1995/004748
(87) International Publication Number: WO 1995029572
(85) National Entry: 1996-10-21

(30) Application Priority Data:
Application No. Country/Territory Date
109,402 (Israel) 1994-04-22

Abstracts

English Abstract


The invention discloses an electrical cooking appliance
including a plurality of electrical heating elements having a
known maximum total wattage and an electrical power
distribution apparatus receiving electrical power from an
electrical power source and distributing power to plural ones
of the plurality of electrical heating elements in accordance
with an established priority when the electrical power
available for distribution is less than the known maximum
total wattage.


French Abstract

La présente invention concerne un appareil de cuisson électrique comportant, d'une part une pluralité d'éléments chauffants électriques (12) caractérisés par une puissance électrique totale admissible connue, et d'autre part un répartiteur d'énergie électrique (20). Ce répartiteur reçoit l'énergie électrique en provenance d'une source d'énergie électrique et la distribue à plusieurs des éléments de la pluralité d'éléments chauffant électriques (12) en tenant compte d'une priorité définie, dans le cas où l'énergie électrique disponible à répartir est inférieure à la puissance électrique totale admissible connue.

Claims

Note: Claims are shown in the official language in which they were submitted.


C L A I M S
1. An electrical cooking appliance including a
plurality of electrical heating elements having a known
maximum total wattage and electrical power distribution
apparatus receiving electrical power from an electrical
power source and distributing power to plural ones of the
plurality of electrical heating elements in accordance
with an established priority when the electrical power
available for distribution is less than the known maximum
total wattage.
2. An appliance according to claim 1 and wherein
the distribution apparatus is responsive both to real
time inputs from an operator who selects which of said
electrical heating elements are to be energized and
desired heating levels for each and to the established
priority which indicates the allocation of available
electrical power in accordance with the real time inputs
from the operator.
3. An appliance according to claim 2 and wherein
said real time inputs determine a real time total wattage
which is less than or equal to said known maximum total
wattage and wherein said distribution apparatus is opera-
tive for distributing power to plural ones of the plural-
ity of electrical heating elements in accordance with
said established priority when the electrical power
available for distribution is less than said real time
total wattage.
4. An appliance according to any of claims 1 - 3
and wherein said established priority is predetermined.
5. An appliance according to any of claims 1 - 3
and wherein said established priority is fixed.

21
6. An appliance according to any of claims 1 - 3
and wherein said established priority is selectable and
changeable by the user.
7. An appliance according to any of the preceding
claims and being operative such that when sufficient
electrical power is available for heating all of the
elements selected by the user to the indicated heating
levels, full power is provided to such elements.
8. An appliance according to any of the preceding
claims and wherein said distribution apparatus is respon-
sive additionally to the operative conditions of the
plurality of electrical heating elements.
9. An appliance according to claim 8 and wherein
the operative conditions of the plurality of electrical
heating elements at least partially determine an opera-
tive condition responsive total wattage which is less
than or equal to said known maximum total wattage and
wherein said distribution apparatus is operative for
distributing power to plural ones of the plurality of
electrical heating elements in accordance with said
established priority when the electrical power available
for distribution is less than said operative condition
responsive total wattage.
10. An appliance according to claim 2 and claim 8
and wherein the real time inputs and the operative condi-
tions of the plurality of electrical heating elements at
least partially determine an operative condition and real
time input responsive total wattage which is less than
or equal to said known maximum total wattage and wherein
said distribution apparatus is operative for distributing
power to plural ones of the plurality of electrical

22
heating elements in accordance with said established
priority when the electrical power available for distri-
bution is less than said operative condition and real
time input responsive total wattage.
11. A method of operating an electrical cooking
appliance including a plurality of electrical heating
elements having a known maximum total wattage comprising
the steps of:
defining an established priority for supply of
electrical power to individual ones of said plurality of
electrical heating elements; and
distributing electrical power from an electri-
cal power source to plural ones of the plurality of
electrical heating elements in accordance with said
established priority when the electrical power available
for distribution is less than the known maximum total
wattage.
12. A method according to claim 11 and wherein said
distributing step is responsive both to real time inputs
from an operator who selects which of said electrical
heating elements are to be energized and desired heating
levels for each and to the established priority which
indicates the allocation of available electrical power in
accordance with the real time inputs from the operator.
13. A method according to claim 12 and wherein said
real time inputs determine a real time total wattage
which is less than or equal to said known maximum total
wattage and wherein said distributing step includes
distributing power to plural ones of the plurality of
electrical heating elements in accordance with said
established priority when the electrical power available
for distribution is less than said real time total watt-
age.

23
14. A method according to any of claims 11 - 13 and
wherein said established priority is predetermined.
15. A method according to any of claims 11 - 13 and
wherein said established priority is fixed.
16. A method according to any of claims 11 - 13 and
wherein said established priority is selectable and
changeable by the user.
17. A method according to any of the preceding
claims 11 - 16 and wherein when sufficient electrical
power is available for heating all of the elements se-
lected by the user to the indicated heating levels, full
power is provided to such elements.
18. A method according to any of the preceding
claims 11 - 17 and wherein said distributing step is
responsive additionally to the operative conditions of
the plurality of electrical heating elements.
19. A method according to claim 18 and wherein the
operative conditions of the plurality of electrical
heating elements at least partially determine an opera-
tive condition responsive total wattage which is less
than or equal to said known maximum total wattage and
wherein said distributing step is operative for distrib-
uting power to plural ones of the plurality of electrical
heating elements in accordance with said established
priority when the electrical power available for distri-
bution is less than said operative condition responsive
total wattage.
20. A method according to claim 12 and claim 18 and
wherein the real time inputs and the operative conditions

24
of the plurality of electrical heating elements at least
partially determine an operative condition and real time
input responsive total wattage which is less than or
equal to said known maximum total wattage and wherein
said distributing step is operative for distributing
power to plural ones of the plurality of electrical
heating elements in accordance with said established
priority when the electrical power available for distri-
bution is less than said operative condition and real
time input responsive total wattage.

Description

Note: Descriptions are shown in the official language in which they were submitted.


W095/29572 2 1 88 3 qO pCI/US95/04748
ELECTRICAL COOKING APPARATUS
The present invention relates to electrical
cooking appliances generally and more particularly to
electrical stoves and stove tops and the operation there-
~of.
A great variety of electrical cooking appli-
ances is known in the patent literature. Various arrange-
ments for allocating electrical power to various heating
elements in such appliances are shown in the following
U.S. Patents: 3,610,886; 4,371,780;,4,482,800; 4,493,979;
4,527,049; 4,538,051; 4,634,843; 4,758,710; 4,810,857;
4,918,291; 4,948,949; 5,171,973; 5,183,996 and ~,270,519.
The present invention seeks to provide a multi-
element electrical cooking appliance which is suitable
for domestic applications wherein limited electrical
power is available.
There is thus provided in accordance with a
preferred embodiment of the present invention an electri-
cal cooking appliance including a plurality of electrical
heating elements having a known maximum total wattage and
electrical power distribution apparatus receiving elec-
trical power from an electrical power source and distrib-
uting power to plural ones of the plurality of electrical
heating elements in accordance with an established prior-

- - -
Woss~ss72 2 1 8 8 3 9 0 pCT~S95104748
ity when the electrical power available for distribution
is less than the known maximllm total wattage.
Preferably the distribution-apparatus is re-
sponsive both to real time inputs from an operator who
selects which of the electrical heating elements are to
be energized and desired heating levels for each and to
the established priority which indicates the allocation
of available electrical power in accordance with the real
time inputs from the operator~
In accordance with a preferred embodiment of
the present invention, the real time inputs determine a
real time total wattage which is less than or equal to
the known ~ximllm total wattage and wherein the distribu-
tion apparatus is operative for distributing power to
plural ones of the plurality of electrical heating ele-
ments in accordance with the established priority when --
the electrical power available for distribution is less --
than the real time total wattage.
The established priority may be predetermined,
fixed or selectable and changeable by the user.
In accordance with a preferred embodiment of
the invention, when sufficient electrical power is avail-
able for heating all of the elements selected by the user
to the indicated heating levels, full power is provided
to such elements.
Preferably, the distribution apparatus is
responsive additionally to the operative conditions of
the plurality of electrical heating elements.
In accordance with a preferred embodiment of
the present invention, the operative conditions of the
plurality of electrical heating elements at least par-
tially determine an operative condition responsive total
wattage which is less than or equal to the known ~x;
total wattage and wherein the distribution apparatus is
operative for distributing power to plural ones of the
plurality of electrical heating elements in accordance

w09s~9572 2 1 88~0 pCT~S95104748
with the established priority when the electrical power
available for distribution is less $han the operative
condition responsive total wattage.
Further in accordance with a preferred embodi-
ment of the present invention, the real time inputs and
the operative conditions of the plurality of electrical
heating elements at least partially determine an opera-
tive condition and real time input responsive total
wattage which is less than or equal to the known ~ximi
total wattage and wherein the distribution apparatus is~
operative for distributing power to plural ones of the
plurality of electrical heating elements in accordance
with the established priority when the electrical power
available for distribution is less than the operative
condition and real time input responsive total wattage.
The present invention also includes a method of-
operating an appliance employing the inventive features --
summarized hereinabove.
The term "operative condition" is defined
herein in a broad sense to include, for example, the
temperature of the electrical heating element, the power
dissipated by the electrical heating element, the power
drawn by the electrical heating element, the current
and/or voltage supplied thereto and the electrical re-
sistance presented by the electrical heating element.
Reference to "temperature" is to be understood
in a broader than usual sense so as to refer broadly to
sensing in any suitable manner of the temperature of the
electrical heating elements or other parts of the cooking
appliance in the vicinity thereof. This sensing may be
carried out, for example, by the use of a thermistor or
other temperature sensor, or alternatively by sensing the
characteristics of the electrical power drawn by the
heating element, its resistance or any other physical
characteristic of the heating element. The
purpose of causing the power distribution to be respon-

Woss/29s72 2 1 &8~90 pCT~S9S/04748
sive to the sensed temperature may be to prevent over-
heating of the heating element, its environs, a cooking
vessel heated thereby or the content$ thereof, or for
any other reason, such as to reduce energy wastage.
The present inventlon will be more fully under-
stood and appreciated from the following detailed de-
scription, taken in conjunction with the drawings in
which:
Fig. 1 is a simplified pictorial illustration
of cooking apparatus constructed and operative in accord-
ance with a preferred embodiment of the present inven-
tion; --
Fig. 2 is a simplified b;ock diagram illustra-
tion of electrical power distribution apparatus useful in
the operation of the apparatus of Fig. 1;
Fig. 3 is a simplified power distribution
diagram for the apparatus of Figs. 1 and 2; Figs.
4A, 4B and 4C are power distribution diagrams for the
apparatus of Figs. 1 and 2 for a given priority and for
varying user inputs;
Figs. SA, 5B and SC are power distribution
diagrams for the apparatus of Figs. 1 and 2 for the same
priority as in Figs. 4A, 4B and 4C, taking into account
operative conditions;
Figs. 6A, 6B, 6C and 6D are power distribution
diagrams for the apparatus of Figs. 1 and 2 for a given
partial priority and varying user inputs;
Fig. 7 is a simplified illustration of a varia-
tion of the apparatus of Fig. 1 wherein heating elements
of non-identical power capacity are employed;

woss/29s72 2 1 8 8 ~ q O pCT~S95/04748
Fig. 8 is a simplified power distribution
diagram for the apparatus of Fig. 7;
Figs. 9A, 9B and 9C are --power distribution
diagrams for the apparatus of Fig. 8 for a given priority
and for varying user inputs;
Fig. 10 is a schematic illustration of a pre-
ferred embodiment of the circuitry of Fig. 2; and
Figs. llA and llB together define a schematic
illustration of cooking element operating circuitr~
coupled to each cooking element and to the circuitry of~
Fig. 10.
Appendix A is a HEX dump of the software resi-
dent in the circuitry of Fig. 10.

woss/29s72 2 1 88390 PCT~S95104748
Reference is now made to Fig. 1, which is a
simplified pictorial illustration of cooking apparatus
constructed and operative in accordance with a preferred
embodiment of the present invention. The cooking appara-
tus comprises a base 10 which may be mounted on a counter
or any other suitable support (not shown). Mounted on~
base 10 are a plurality of electrical heating elements~
12, typically, but not necessarily four in number.
Electrical cooking elements 12 may be any
suitable electrical resistance cooking elements, such as
are found in conventional electric ranges and range tops.
Alternatively they may be radiation cooking elements,
such as those commercially available, inter alia from
Sholtes of France. Preferably, but not necessarily, the --
electrical cooking elements 12 may be high efficiency
cooking elements such as those described and claimed in
U.S. Patent 5,221,829 of the present applicants/assignee,
the disclosure of which is hereby incorporated by refer-
ence.
A plurality of control assemblies 14 are pro-
vided for enabling a user to select the amount of elec-
trical power to be supplied to one or more of the cooking
elements 12. For convenience, in Fig. 1, the four cooking
elements are individually designated as cooking elements
A, B, C and D. Control assemblies 14 are likewise
designated by the letters-A, B, C and ~ to indicate which
control assembly 14 controls which cooking element 12.
In accordance with a preferred embodiment of
the present invention, in cases when the available elec-
tric power is not sufficient, the supply of electrical
power to the individual cooking elements is not deter-
mined solely by the user's operation of the control
assemblies 14, but is also dependent upon a preselected

woss~g572 2 1 b 8 3 9 0 PCT~Sg5/047~
priority among the individual cooking elements 12.
This priority is established either at the
factory or upon installation of the u~it by employing of
a priority select control panel 16. Panel 16 is normally
not accessible to the user during normal use of the
cooking apparatus. According to an alternative embodi-
ment of the present invention, the priority may be se-
lected or modified by the user after installation. In
such a case, user access to panel 16 is provided.
Electrical power is supplied to the cooking~
apparatus from the electrical mains and preferably from a
single phase electrical source via an ordinary line cord
18. Line cord 18 supplies electrical power to power
distribution apparatus 20 which is responsive to the
user inputs at control assemblies 14 and the priority
established at panel 16 to govern the power supply to the
individual cooking elements 12. --
In accordance with a preferred embodiment of
the present invention, but not necessarily, the power
distribution apparatus 20 may also be responsive to the
sensed operative conditions of the individual cooking
elements 12, indicated schematically by sensing apparatus
22 associated with each cooking element 12.
Reference is now made to Fig. 2, which is a
simplified block diagram illustration of the electrical
power distribution apparatus 20 useful in the apparatus
of Fig. 1. The apparatus of Fig. 2 includes a CPU 30
which receives user inputs from control assemblies 14,
priority inputs from priority select control panel 16 and
optionally receives cooking element operative conditions
inputs from sensors 22. The CPU 30, whose operation will
be described hereinbelow in greater detail, is operative
to provide control inputs to a plurality of relays 32,
designated individually A, B, C and D to correspond to
the cooking elements 12. The relays 32 receive electrical
power from the mains and supply it in a controlled manner

wo g~ng572 2 1 8 8 3 9 0 ~CT~S95/047~
to corresponding cooking elements 12.
Reference is now made to Fig. 3 which is a
simplified power distribution diagram for the apparatus
of Figs. 1 and 2. The diagram of Fig. 3 indicates that
for a particular, non-limiting example, each cooking
element is allocated not more than 1500 Watts of electri-
cal power at any given time. Thus, if a total of 3000
Watts of electrical power is available to the cooking
apparatus of Fig. 1, only two cooking elements receive
power at any given instant in time.
Power switching between cooking elements 12
occurs in cycles, each typically having four time seg-
ments, during each of which electrical power may be
directed to a different cooking element by relays 32. It
is appreciated that each cycle may include any desired
suitable number of time segments, lesser or greater than
four in number. A typical cycle has a duration of a few --
seconds. Normally the cycle is divided into at least ten
time segments. A lesser number is shown and described
herein for the sake of clarity and conciseness.
Reference is now made to Figs. 4A, 4B and 4C,
which are power distribution diagrams for the apparatus
of Figs. 1 and 2 for a given priority and for varying
user inputs and when operative conditions sensing inputs
are not employed. The example illustrated by Figs. 4A, 4B ~
and 4C is one in which cooking element A has absolute
priority over cooking element B, which in turn has abso-
lute priority over cooking element C. Cooking element C
has absolute priority over cooking element D. For the
purposes of explanation and illustration it is assumed
that a total of 3000 Watts of power is available to the
cooking apparatus and each cooking element can receive no
more than 1500 Watts at any given time.
Fig. 4A illustrates operation of the power
distribution apparatus 20 in general and of CPU 30 in
particular when the user inputs at the control assemblies

2 1 88390
wog5nss72 PCT~Sg5/04748
14 are as follows:
CONTROL I.D.CONTROL SETTING
A 5.0
B 7.5
C 7.5
D 10.0
A setting of 10.0 corresponds to a full allot-
ment of 1500 Watts over an entire cycle, a setting of 5.0
corresponds to a full allotment of 1500 Watts over ha~f
of an entire cycle, etc. -
It is seen that notwithstanding the limitedavailability of electrical power and in accordance with
the established priority, cooking element A receives its
full requested power allotment, i.e. 1500 Watts over two
of four of the time segments of each cycle. Similarly,
notwithstanding the limited availability of electrical
power and in accordance with the established priority,
each of cooking elements B and C r~eceives its full re-
quested power allotment, i.e. 1500 Watts over three of
four of the time segments of each cycle.
Due to the limited availability of electrical
power and in accordance with the established priority,
cooking element D does not receive its full requested
power allotment, since no power remains available.
The power allocation illustrated in Fig. 4A ~
continues so long as there is no change in the user input
at the control assemblies 14 and no change in the estab-
lished priority.
Referring now to Fig. 4B, it is seen that when
there is a change in the user input at the control assem-
blies 14, the power distribution changes accordingly.
Here it is seen that cooking element A is turned off by
the user. Accordingly, the power that was previously
directed to cooking element A is now available for allo-
cation to cooking element D, which receives one-half of
its full requested power allotment, i.e. 1500 Watts over

21 88~90
WO 9S/29572 PCI~/US95104748
two of four of the time segments of each cycle.
Referring now to Fig. 4C, it is seen that when
there is a further change in the user input at the con-
trol assemblies 14, the power distribution again changes
accordingly. Here it is seen that cooking element B is
also turned off by the user. Accordingly, the power that
was previously directed to cooking element B is now
available for redistribution and allocation to cooking
element D, which receives all of its full re~uested power
allotment, i.e. 1500 Watts over all four of the time~
segments of each cycle. In this case, some of the avail-
able electrical power is not used.
It is noted that at no time is more than 3000Watts of electrical power drawn from the mains and that
all allocations of power are carried out by time division
of the supply of power in quantities of lS00 Watts.
Reference is now made to Figs. SA, SB and SC, --
which are power distribution diagrams for the apparatus
of Figs. 1 and 2 for a given priority and for varying
user inputs and when operative conditions sensing inputs
are employed. The priority is exactly the same as in the
example illustrated in Figs. 4A, 4B and 4C, i.e. cooking
element A has absolute priority over cooking element B,
which in turn has absolute priority over cooking element
C. Cooking element C has absolute priority over cooking ~
element D.
As in the example shown in Figs. 4A - 4C, for
the purposes of explanation and illustration it is as-
sumed that a total of 3000 Watts of power is available to
the cooking apparatus and each cooking element can re-
ceive no more than 1500 Watts at any given time.
Fig. 5A illustrates operation of the power
distribution apparatus 20 in general and of CPU 30 in
particular when the user inputs at the control assemblies
14 are as follows:

WO 95/29572 2 ~ 8 8 3 9 0 pCT/US9~i/04748
CONTROL I . D . CONTROL SETTING
A 10.0
B 7.5
C 7.5
D 10.0
It is seen that notwithstanding the limited
availability of electrical power and in accordance with
the established priority, cooking element A receives its
full requested power allotment, i.e. 1500 Watts over ail~
four of the time segments of each cycle. Similarly,
notwithstanding the limited availability of electrical
power and in accordance with the established priority,
cooking element B receives its full requested power
allotment, i.e. 1500 Watts over three of four of the time
segments of each cycle.
Due to the limited availability of electrical --
power and in accordance with the established priority,
cooking element C receives only part of its full request-
ed power allotment, i.e. 1500 Watts over one of four of
the time segments of each cycle, since no additional
power remains available.
Cooking element D does not receive its full
requested power allotment, since no power remains avail-
able.
- The power allocation illustrated in Fig. 5A
continues so long as there is no change in the user input
at the control assemblies 14, no change in the estab-
lished priority and no effective change in the cooking
element-operative conditions inputs.
Referring now to Fig. 5B, it is seen that when
there is an effective change in the operative conditions
input to CPU 30, the power distribution changes accord-
ingly. The term "effective change" is used here to denote
the exceedance of a predetermined threshold which causes
the CPU 30 to cut down or cut off the power supply to the

woss~ss72 2 ~ v ~ 3 9 0 PCT~S95/04748
corresponding coo~ing element.
Here it is seen that when the operative condi-
tions of the cooking element A exceed a predetermined
threshold resulting in a predetermined cut down of
electrical power thereto, the power that was previously
directed to cooking element A is now available for redis-
tribution to cooking element C and D. Cooking element C
now receives all of its full required power allotment,
i.e. 1500 Watts over three of four of the time segments
of each cycle and cooking element D now receives one-
~quarter of its full requested power allotment, i.e. 1500
Watts over one of four of the time segments of each
cycle.
Referring now to Fig. 5C, it is seen that when
there is a further change in the effective operative
conditions input to the CPU 30, the power distribution
again changes accordingly. Here it is seen if the opera- --
tive conditions of cooking element A change sufficiently
so that full electric power supply thereto is recom-
menced, the power that was previously redistributed to
cooking elements C and D is now made available once again
to cooking element A, in a time distribution which typi-
cally is identical to that shown in Fig. 5A, in accord-
ance with the predetermined priority.
Reference is now made to Figs. 6A, 6B, 6C and
6D, which are power distribution diagrams for the appara-
tus of Figs. 1 and 2 for a different priority from that
illustrated in Figs. 4A - 5C and for varying user inputs
and when operative conditions sensing inputs are not
employed.
The example illustrated by Figs. 6A, 6B, 6C and
6D is one in which cooking element A has priority over
cooking element B, which in turn has priority over cook-
ing element C. Cooking element C has priority over cook-
ing element D. The priorities are not, however, absolute,
as in the case illustrated in Figs. 4A - 5C. Rather,

wogsngs72 2 1 88~ 0 PCT~s95/04748
notwithstanding the priority, each of the cooking ele-
ments is guaranteed availability of a portion of its full
power allotment in accordance with the following table:
COOKING ELEMENT % GUARANTEED
A 75%
B 75%
C 25%
D 25%
For the purposes of explanation and illustra-
tion it is assumed that a total of 3000 Watts of power is
available to the cooking apparatus and each cooking
element can receive no more than 1500 Watts at any given
time.
Fig. 6A illustrates operation of the power
distribution apparatus 20 in general and of CPU 30 in --
particular when the user inputs atJthe control assemblies
14 are as follows:
CONTROL I.D. CONTROL SETTING
A 10.0
B 10.0
C 0.0
D 0.0
A setting of 10.0 corresponds to a full allot-
ment of 1500 Watts over an entire cycle.
It is seen that notwithstanding the established
priority, since sufficient power is available to meeting
the user inputs, each of cooking elements A and B re-
ceives its full requested power allotment, i.e. 1500
Watts over all four of the time segments of each cycle.
The power allotment guaranteed to cooking elements C and
D but not requested, is thus utilized by cooking elements
A and B.
The power allocation illustrated in Fig. 6A

w095/29572 2 1 8 8 3 9 0 PCT~S95/04748
14
continues so long as there is no change in the user input
at the control assemblies 14 and no change in the estab-
lished priority.
Referring now to Fig. 6B, it is seen that when
there is a change in the user input at the control assem-
blies 14, the power distribution changes accordingly.
Here it is seen that cooking element C is turned on by
the user to a setting 10Ø Accordingly, some of the
power that was previously directed to cooking element 'B
is allocated to cooking element C, which receives its
guaranteed power allocation, in this case one-quarter of
its full requested power allotment, i.e. 1500 Watts over
one of four of the time segments of each cycle. Cooking
element B gives up power rather than cooking element A in
accordance with the established priority.
Referring now to Fig. 6C, it is seen that when
there is a further change in the user input at the con- --
trol assemblies 14, the power distribution again changes
accordingly. Here it is seen that cooking element D is
also turned on by the user to a setting 10Ø According-
ly, some of the power that was previously directed to
cooking element A is allocated to cooking element D,
which receives its guaranteed power allocation, in this
case one-quarter of its full requested power allotment,
i.e. 1500 Watts over one of four of the time segments of
each cycle. It is seen that in this situation, each
cooking element receives its guaranteed allocation.
Referring now to Fig. 6D, it is seen that when
there LS yet a further change in the user input at the
control assemblies 14, the power distribution once again
changes accordingly. Here it is seen that cooking element
A is turned off by the user. Accordingly, the power that
was previously directed to cooking element A is allocated
to other cooking elements in accordance with the estab-
lished priority. Thus cooking element B receives its
full requested allocation, i.e. 1500 Watts over all four

Woss~ss72 2 ~ ~8390 pCT~S9S/04748
of the time segments of each cycle and cooking element C
receives most of its requested allocation, i.e. 1500
Watts over three of the four time segments of each cycle.
It is seen that in this situation, each cooking element
receives at least its guaranteed allocation to the extent
requested.
Reference is now made to Fig. 7, which is a
simplified pictorial illustration of part of cooking
apparatus constructed and operative in accordance w~th
another preferred embodiment of the present invention.
The cooking apparatus may be identical to that illustrat-
ed in Fig. 1 and described hereinabove, with the sole
exception that here, cooking element A has twice the
output capacity of each of the remaining cooking elements
B, C and D. Thus, if each of cooking elements B, C and D
is arranged to receive up to 1000 Watts at any given
time, cooking element A is arranged to receive up to 2000 ~
Watts at any given time.
- Reference is now made to Fig. 8 which is a
simplified power distribution diagram for the apparatus
of Fig. 7. The diagram of Fig. 8 indicates that for a
particular, non-limiting example, each of cooking ele-
ments B, C and D is allocated not more than 1000 Watts of
electrical power at any given time and cooking-element A
is allocated not more than 2000 Watts of electrical power
at any given time. Thus if only 3000 Watts of electrical
power is available at any given time, all of the cooking
elements cannot be operated at full capacity at the same
time.
Reference is now made to Figs. 9A, 9B and 9C,
which are power distribution diagrams for the apparatus
of Fig. 7 for a given priority and for varying user
inputs and when operative conditions sensing inputs are
not empl-oyed. The example illustrated by Figs. 9A, 9B and
9C is one in which cooking element A has absolute priori-
ty over cooking element B, which in turn has absolute

w09~29572 2 1 ~ 83 9 0 PCT~S95/047~
16
priority over cooking element C. Cooking element C has
absolute priority over cooking element D.
Fig. 9A illustrates operation of the power
distribution apparatus 20 in general and of CPU 30 in
particular when the user inputs at the control assemblies
14 are as follows:
CONTROL I.D. CONTROL S~ G
A 20.0
B 10.0
C 10.0
D 10.0
A setting of 20.0 for cooking element A corre-
sponds to a full allotment of 2000 Watts over an entire
cycle, and a setting of 10.0 for cooking elements B, C
and D corresponds to a full allotment of 1000 Watts over
an entire cycle. --
It is seen that notwithstanding the limited
availability of electrical power and in accordance with
the established priority, cooking element A receives its
full requested power allotment, i.e. 2000 Watts over all
four of the time segments of each cycle. Similarly,
notwithst~n~ing the limited availability of electrical
power and in accordance with the established priority,
cooking element B receives its full requested power
allotment, i.e. 1000 Watts over all four of the time
segments of each cycle.
Due to the limited availability of electrical
power and in accordance with the established priority,
cooking elements C and D do not receive their full re-
quested power allotment, since no power remains avail-
able.
The power allocation illustrated in Fig. 9A
continues so long as there is no change in the user input
at the control assemblies 14 and no change in the estab-
lished priority.

woss/29s72 2 1 8 8 3 9 0 PcT~ssslo4748
Referring now to Fig. 9B, it is seen that when
there is a change in the user input at the control assem-
blies 14, the power distribution c~anges accordingly.
Here it is seen that the power requested by the user at
cooking element B is reduced. Accordingly, the power that
was previously directed to cooking element B is now
available for allocation to cooking element C, which
receives one-half of its full requested power allotment,
i.e. 1000 Watts over two of four of the time segments ~f
each cycle.
Referring now to Fig. 9C, it is seen that when
there is a further change in the user input at the con-
trol assemblies 14, the power distribution again changes
accordingly. Here it is seen that the power requested ~y
the user at cooking element A is also reduced. According-
ly, the power that was previously directed to cooking
element A is now available for redistribution and alloca- -
tion to cooking element C, which nOw receives its full
requested power allotment, i.e. 1000 Watts over all four
time segments of each cycle, and to cooking element D
which receives one half of its full requested power
allotment, i.e. 1000 Watts over two of the four time
segments of each cycle.
It is noted that at no time is more than 3000
Watts of electrical power drawn from the mains and that -
all allocations of power are carried out by time division
of the supply of power.
Reference is now made to Fig. 10 which is a
self-explanatory schematic illustration of a preferred
embodiment of the circuitry of Fig. 2. The circuitry of
Fig. 10 includes a microprocessor 90, preferabiy a Moto-
rola MC 68705R5. A HEX dump in Motorola S Record Format
of a preferred embodiment of the operating software
resident in the microprocessor 90 is incorporated herein
in Appendix A. The circuitry of Fig. 10 and the software
employed therein includes the provision of an optional

WO 95/29572 2 1 8 83 9 0 PCI/U~ 1748
18
timer function which enables automatic turning off of a
cooking element after a preset time.
Reference is now made to Figs. llA and llB,
which together define a self-explanatory schematic illus-
tration of a preferred embodiment of cooking element
operating circuitry which is coupled to each cooking
element and to the circuitry of Fig. 10, as indicated
thereon.
It is to be appreciated that systems combini~g
features from the various embodiments illustrated an
described herein are also within the scope of the inven-
tion.
It will be appreciated that the present inven-
tion is not limited by what has been particularly shown
and described hereinabove. Rather the scope of the
present invention is defined only by the claims which
follow:

WO 95129572 2 1 ~ 8 3 9 0 pCTlUS95/04748
19
Appendix A
S00600004844521B
S1230100B742A44A2704A609B700B642A1402604A640B700B642A1412604A64FB700B6421B
S1230120A1422604A624B7008642A1435601~6308700B642A1442604A619B700B642A1453F
S12301402604A612B700B642A1o~601~603B700B642A1472604A678B7008642A14~69~1
S12301603FOOB642A1492604A618B700B642A~Q~'501t~GFrB70081011219B612AA70871201
S1230130BE10E614A10926046F142007BE10E6144CE714B610A105~1;09g~t614AlOf~6Q~OR
S12301A06F1481B743/~15C)~7090~0q3~3F20023F3FB63FA1FA260C3F3F3~,~3FR~3FA10893
S12301~0~6q~f3E81A601B7443F10B610A10~03~ AA6~ 0-2~t10E614B7~53D10D9
S12301F~608B639A10126023F45~610A1042~0ÇR6~R~101~6068F10E61FB745B61~r~ 7
S1~Q~ 2AB61qA~tFr~6083~q~704B63A27021C~5B610A10424124D260~L3n39~f~Q~F~7
S1~0~01058A6d~t~2tA608t~ 2024B610A104241E975~5~2~t6-2~ D~/12B6~AD3
S1230240B72D3F2C4D2A034Ah/~C~04A64AB7453D3F270CB610A105~60~63r~A40B74s6C
S1230260B645CD0100B602B844B702B644CD01A30B0308B636BA44B7362008B644A8FFB46F
S123028036B736B636B13~ 0~B644B436B812B712B636B737B603A450275EB613B44427C9
S12302A0583F3BA601 B7~0A62CB741 B644A8FFB413B7130D0305CD01 J l~n~H63F~4012667
S12302C015BE10E6142606A609E7142007BE10E6144AE7142013BE10E614A10926046F14E1
S1~:30~FOZ~07BE10E6144CE7143D1Q~60CR639~ 083F14B612A40EB712053EOCB612B444B2
Sl2303002604BE106F14:'0~RB610A4042618BElOE614260AB6~4A8FFB412B71ZO06B61254
S1~:~03~0BA4~B712200AB612B4442604BE106F14B612A401~f;06P612A40FB71~R60-'3A45003
S12303q~f ;06B6138A44B713A60AB746B6463A4~i26~3C103844CC01CB813f10B610A1 B0
S1~?~o36oo~4o97s8Ffi5l-H~t6~t~ BA~c 2~t1058Ff;~FA001E72F24026A2E3D10FD
S1~0380~51DBE1058F~ H~ t651-~2l~A1RQ~60FR~t,`A10~608B612A40EB7123F143CF4
S12303A01020BA09120~.3C3A~OQ~3F38R638A13~3F383D1A261EA609B71A3D192612EC
S12303COA605B7193D1826063F193F1A20023A18~00~A19~0C'~1AB61~0FR619260AOA
S1~303FOR6182606B612A41026043F392004A601B739813F47B603B7 .93D5R~65nA609B715
S12301QO:~R3F10B610A103224997E61BE027E71FBE1061F2A026F1FB63EA~O~ÇOCB63D98
S1230420B110~?~06PF10E614E71FB63E/~0~50C3D1Q~508E~639~704BE106F1FBE10F6~36C
S1230440E727BE10E614E723BE10E614E71B3C1020B1B63CB73DA6~ 3~3A~RR63t`A1FF5c
S1~0150~714A601BE3C2704485A26FCB40327068F3~F~i34B63CA880A1832506A60459
S1230480873C~Q~6R63C4CB710B610A103æ1BA604873C3D10260~3D39:~60BBF10t623;~BA
S12304A0059FB73C20043C1020DFB63CA10~03g~6~:X3863DA1FF271AB63cB13D2714A6B8
S12304C001BE3D2704485A26FCB4032706RF3~F~2634B63DA880A1832506A604B73D20BF
S12304F0~63~4CB710B610A103Z1BA604B73D3D10260~3n39~60BBEloE62727o59FB7oc
S12305003~0043C1020DFB63DA10~03g~6A27B601B748A4FOB748B63CA104270FA60185
S1~0~0RF~C2704485A26FCBA4BB748R63nA104270EA601BE3D2704485A26FCBA48B7486E
S1230540B648B7018181A6FF8704B705B706B7133F123F2B3F3E3F363F373F113F38A60AA2
S1230560B74A3F393F4B3F413F403F10B610A106æ17976F14B610A403B74C976F1FBE4CC7
S1~30580586F2E6F2F3C1020E33D4B2610A696B74B863A27043F3A2004A601B73AB640BA79
S12305A0412618863B270A3F40A625B7413F3B200A3F40A6E9B741A601B73B3D112607A6FO
S1Z'305Co~C:~11CD03F33D4A2607A66FB7 1~nO35~A11B641A001B74124023A403A4A3A32
S11DosEo4BCD01C520A380AE107FSCA37F26FM60~B~3CA607B73DCC054SA9
S1050FFE05E701
S1041FDFOOFD
S9030000FC
SUBSTITUTE SHEET (RULE 26j

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

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Event History

Description Date
Inactive: IPC from MCD 2006-03-12
Time Limit for Reversal Expired 1998-04-20
Application Not Reinstated by Deadline 1998-04-20
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice 1997-04-18
Application Published (Open to Public Inspection) 1995-11-02

Abandonment History

Abandonment Date Reason Reinstatement Date
1997-04-18
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
BEZALEL PERELMUTER
LANCET S.A.
Past Owners on Record
SHIMON YAHAV
YAIR DAAR
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Claims 1995-11-01 5 187
Drawings 1995-11-01 10 310
Description 1995-11-01 19 865
Abstract 1995-11-01 1 15
Representative drawing 1999-06-09 1 34
International preliminary examination report 1996-10-20 6 214
Courtesy - Office Letter 1996-11-21 1 41