Canadian Patents Database / Patent 2069399 Summary

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(12) Patent: (11) CA 2069399
(54) English Title: KAYAK RIGHTING METHOD AND APPARATUS
(54) French Title: METHODE ET APPAREIL DE REDRESSEMENT DE KAYAK
(51) International Patent Classification (IPC):
  • B63B 35/85 (2006.01)
  • B63B 35/71 (2006.01)
  • B63C 9/00 (2006.01)
(72) Inventors :
  • BLACHFORD, ALISTAIR MAITLAND (Canada)
(73) Owners :
  • BLACHFORD, ALISTAIR MAITLAND (Canada)
(71) Applicants :
  • BLACHFORD, ALISTAIR MAITLAND (Canada)
(74) Agent: NA
(45) Issued: 2003-04-08
(22) Filed Date: 1992-05-25
(41) Open to Public Inspection: 1993-11-26
Examination requested: 2000-05-10
(30) Availability of licence: Yes
(30) Language of filing: English

English Abstract



The present invention provides a method and an apparatus for
reducing the skill required of a paddler to right a capsized kayak
without exiting it, and to thus avoid the dangers associated with
exiting a kayak after capsize. In broad terms, the paddler is
provided with a simple and rapid means of creating a buoyant force
to one side of the capsized kayak, which can be used to produce a
generous amount of torque for righting. More specifically, an
inflatable flotation device is held in place on the deck of the
kayak and is provided with a handle. Upon capsize the paddler
grasps and pulls the handle, whereupon the flotation element is
released from its securing container and automatically inflated from
compressed gas cartridges. The paddler can then lean on the handle
and attached flotation element to right the kayak without exiting
it.


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


THE EMBODIMENTS OF THE INVENTION IN WHICH EXCLUSIVE PROPERTY OR
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of righting a capsized kayak by an occupant, said kayak
having a hull, said occupant having a hand, comprising:
a) providing inflatable means for buoyant support comprising:
i) inflatable means for flotation having a volume when
inflated of at least one cubic foot, aid adapted for
positioning to one side only of said hull, spaced from said
hull, when inflated;
ii) means for rapidly inflating said flotation means to a
volume of at least one cubic foot; and
iii) handle means connected to said flotation means,
adapted for grasping by a hand of said occupant and for
maintaining said occupant's hand proximate to said flotation
means while said hand applies force to said handle means;
wherein said flotation means is adapted to be movable, relative
to said hull, after inflation, by means of force exerted by said
handle means, in an arc of at least 90 degrees relative to said
hull;
b) grasping said handle means;
c) inflating said flotation means;
d) locating said flotation means to one side of said hull,
spaced from said hull; and
e) applying sufficient force to said handle means to rotate said


kayak to an upright position.
2. A method as claimed in claim 1, wherein the occupant has two hands
and is holding a paddle, comprising the further step of placing the
paddle in a first hand prior to grasping said handle means, and wherein
said handle means is grasped with the second hand.
3. A method of righting a capsized kayak by an occupant, said kayak
having a hull, said occupant having a hand, comprising:
a) providing inflatable means for buoyant support comprising:
i) inflatable means for flotation having a volume when
inflated of at least one cubic foot, and adapted for
positioning to one side only of said hull, spaced from said
hull, when inflated;
ii) means for rapidly inflating said flotation means to a
volume of at least one cubic foot; and
iii) handle means connected to said flotation means,
adapted for grasping by a hand of said occupant and for
maintaining said occupant's hand proximate to said flotation
means while said hand applies force to said handle means;
wherein said flotation means is adapted to be movable, relative
to said hull, after inflation, by means of force exerted by said
handle means, in an arc of at least 90 degrees relative to said
hull;
b) inflating said flotation means;
c) grasping said handle means;
d) locating said flotation means to one side of said hull,


spaced from said hull; and
e) applying sufficient force to said handle means to rotate said
kayak to an upright position.
4. A method as claimed in claim 3, wherein the occupant has two hands
and is holding a paddle, comprising the further step of placing the
paddle in a first hand prior to grasping said handle means, and wherein
said handle means is grasped with the second hand.
5. An apparatus for aiding an occupant in righting a capsized kayak,
said occupant having a hand, said kayak having a hull, comprising:
a) inflatable means for flotation having a volume when inflated
of at least one cubic foot, and adapted for positioning to one
side only of said hull, spaced from said hull, when inflated;
b) handle means connected to said flotation means, adapted for
i) grasping by a hand of said occupant, and for
ii) maintaining said occupant's hand proximate to said
flotation means while said hand applies force to said handle
means;
c) means for rapidly inflating said flotation means to a volume
of at least one cubic foot; and
d) actuating means for actuating said means for inflating
through action of a hand in continual grasp with said handle
means;
wherein said flotation means is adapted to be movable, after inflation,
by means of force exerted by said handle means, in an arc of at least 90
degrees relative to said hull.


6. An apparatus as claimed in claim 5, wherein said flotation means has
a volume of approximately two cubic feet when inflated.

7. An apparatus as claimed in claim 5, further comprising valve means
for deflating said flotation means.

8. An apparatus as claimed in claim 5, further comprising means for
orally inflating said flotation means.

9. An apparatus as claimed in claim 5, further comprising means for
attaching a paddle to said flotation means.

10. An apparatus as claimed in claim 5, further comprising valve means
for deflating said flotation means, means for orally inflating said
flotation means and means for attaching a paddle to said flotation
means.

11. An apparatus for aiding an occupant in righting a capsized kayak,
said occupant having a hand, said kayak having a hull, comprising:
a) inflatable means for flotation having a volume when inflated
of at least one cubic foot, and adapted for positioning to one
side only of said hull, spaced from said hull, when inflated;
b) means for rapidly inflating said flotation means to a volume
of at least one cubic foot;
c) handle means connected to said flotation means, adapted for
i) grasping by a hand of said occupant, and for
ii) maintaining said occupant's hand proximate to said
flotation means while said hand applies force to said handle
means; and


d) means for holding said flotation means in relation to said
kayak, adapted so that action of a hand in continual grasp with
said handle means is sufficient to release said flotation means
to a position spaced from said hull of said kayak;
wherein said flotation means is adapted to be movable, after inflation,
by means of force exerted by said handle means, in an arc of at least 90
degrees relative to said hull.

12. An apparatus as claimed in claim 11, wherein said means for holding
said flotation means comprises means for releasably securing said
flotation means to said kayak, said occupant, a sprayskirt or spraydeck
associated with said kayak, or an article of equipment or clothing worn
by said occupant.

13. An apparatus as claimed in claim 11, further comprising valve means
for deflating said flotation means.

14. An apparatus as claimed in claim 11, further comprising means for
orally inflating said flotation means.

15. An apparatus as claimed in claim 11, further comprising means for
attaching a paddle to said flotation means.

16. An apparatus as claimed in claim 11, further comprising valve means
for deflating said flotation means, means for orally inflating said
flotation means and means for attaching a paddle to said flotation
means.

17. An apparatus as claimed in claim 5 further comprising means for
holding said flotation means in relation to said kayak, adapted so that
action of a hand in continual grasp with said handle means is sufficient
to release said flotation means to a position spaced from said hull of
said kayak.


18. An apparatus as claimed in claim 17, further comprising valve means
for deflating said flotation means, means for orally inflating said
flotation means and means for attaching a paddle to said flotation
means.

19. An apparatus as claimed in claim 17, wherein said means for
inflating comprises:
a) a cartridge of compressed gas with a perforable seal;
b) puncturing means having a sharp point for puncturing said
seal, and adapted to be movable to a position to puncture said
seal;
c) means for biasing said puncturing means in a direction away
from said seal; and
d) a slidable triggering element adapted to move in relation to
said puncturing means and thereby cause said puncturing means to
move into said puncturing position.

20. An apparatus as claimed in claim 19, wherein said means for
inflating comprises a body to which said cartridge is secured, in which
a chamber is formed containing said puncturing means and said biasing
means, in which a channel is formed for guiding the movement of said
triggering element, and along which said triggering element is moved to
initiate inflation.


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



KAYAK RIGHTING METHOD AND APPARATUS
The invention relates to kayaking safety accessories and
techniques, and more particularly to a method and an apparatus for
righting a capsized kayak while remaining seated in it.
The kayak, originally designed by the Inuit of northern
Canada as a fast and seaworthy hunting craft for the Arctic waters,
has become a popular recreational boat. It currently takes one of
two basic forms, either that of the white-water kayak designed for
running rivers, or the sea kayak. The former is generally shorter
and of low volume for maneuverability. The latter is longer and of
higher volume to provide greater directional stability and allow for
the stowage of cargo. Sea kayaking has become a very popular
recreational activity, as it is a pleasant way to enjoy the
outdoors, and a convenient way to travel to remote campsites.
In kayaks of both types the paddler is sealed into the boat
by a waterproof "skirt" worn around the waist and sealed around the
lip of the cockpit in which the paddler sits. The skirt prevents
water from entering the kayak even when the kayak is overturned. An
overturned kayak may be righted by the paddler without removing the
skirt by performing a skill-requiring maneuver called an "Eskimo
roll" (or simply "roll"). To do a roll, the paddler applies
sufficient torque using correct orientation and movement of the
paddle to rotate the boat and his or her body to an upright
position. If the paddler is unable to right the boat using the
Eskimo roll, but a second boat is near, a rescue can be performed in
which the second boat is brought close enough to the capsized boat
so that the capsized paddler's waving hand can grasp its bow. The
capsized paddler can use the support of the second boat's bow to
rotate him- or herself to an upright position without exiting
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2069399
his/her boat. A paddler unable to right the kayak can free him- or
herself from the boat (by releasing the skirt from the cockpit rim)
and slip out of the cockpit while underwater.
Sea kayaks rarely capsize, and so sea kayakers are generally
less experienced in performing an Eskimo roll than are white-water
kayakers. However, if a sea kayaker fails to right the boat and it
becomes necessary to release the skirt and exit the boat, he/she is
confronted by a number of life-threatening dangers. The kayaker may
become separated from the boat and/or paddle, possibly far from
shore and possibly in rough seas. The temperature of~the water will
often be low enough to reduce the paddler's strength over a fairly
short time, and make re-entry to the boat more difficult. This
serious situation can lead to hypothermia and/or drowning, and fear
or panic can further complicate the situation. Even when the paddler
succeeds in re-entering the boat it will be filled with water,
unstable, and liable to re-capsize before it can be emptied.
Consequently the preferred response to a capsize is righting the
boat without the paddler exiting the boat.
Prior art exists for the prevention of capsize. However,
such devices necessarily alter handling and performance
characteristics of the kayak and, should they fail to prevent
capsize, they may hinder immediate righting of the kayak.
Various prior art aids to the paddler in the event of capsize
exist, but these have concentrated on aiding re-entry after exiting
the boat rather than righting the boat without exiting it. For
example, one device provides a paddle float which is inflated and
secured to one blade of the paddle. The other end of the paddle is
then fastened to the boat deck behind the cockpit. The paddle then
functions as an outrigger to stabilize the kayak as the paddler
attempts re-entry. Another emergency aid simply consists of a large,
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2969399
orally inflatable bag upon which the paddler sits or leans to aid
re-entry. It takes many minutes to inflate. Both of these devices
have the disadvantage of subjecting the paddler to the dangers noted
above which are associated with exiting the boat.
There is therefore a need for a method and/or device which,
requiring little skill or practice, enables a paddler to right an
overturned kayak without exiting the kayak. The righting of a kayak
and paddler requires the generation of torque about the long axis of
the kayak. The skill requirement in the Eskimo roll lies in
minimizing the required torque, and in generating the resulting
torque requirement from specific orientation and movement of a
paddle blade. The fundamental idea of the present invention is to
provide kayakers with a simple and rapid means of creating a buoyant
force to one side of the kayak, which can be used to produce a
generous amount of torque for righting.
It is an object of the invention to provide a method by which
a paddler can accomplish results equivalent to those of the skill-
requiring maneuver, the Eskimo roll. It is another object of the
invention to provide, for such a method, an apparatus which is
quickly and easily deployable upon capsize and which provides a
buoyant force that a kayaker can use to rotate the kayak and to
raise his/her body back to an upright position, in the same way that
he/she could use the bow of a rescue boat.
The present invention reduces the skill required of a paddler
to right a capsized kayak without exiting it, and to thus avoid the
dangers associated with exiting a kayak after capsize. In
accordance with a broad aspect of the invention, the paddler is
provided with a simple and rapid means of creating a buoyant force
to one side of the capsized kayak, which can be used to produce a
generous amount of torque for righting.
- 3 -




2~.~9~9~
According to an aspect of the invention, a method for
righting a capsized kayak provides the paddler with a handled,
rapidly self-inflating means for flotation. The flotation means,
after inflation, has a minimum volume of one cubic foot, and is
S adapted for positioning to one side only of the kayak, spaced from
the kayak, and for movement in an arc of at least 90 degrees about
the kayak by means of force applied to the handle. After capsize
the handle of the flotation means is grasped by a hand of the .
paddler, and the flotation means is inflated and located to one side
of the kayak, spaced from the kayak. Sufficient force is then
applied to the handle to rotate the kayak and paddler to an upright
position. Preferably, in an initial step, the paddle in use by the
paddler is placed in one hand, prior to the grasping of the handle
of the flotation. means with the other hand, so that the paddle is
retained for immediate seaworthiness upon righting. According
another aspect of the invention, in a variation of this method for
righting, inflation of the flotation means may be actuated before
the handle is grasped.
According to a further aspect of the invention, an apparatus
for aiding an occupant in righting a capsized kayak comprises an
inflatable means for flotation and means for non-orally inflating
the flotation to a volume of at least one cubic foot in less than
ten seconds. The apparatus comprises a handle connected to said
flotation means which is adapted for grasping by a hand and
maintaining the grasping hand proximate to the flotation while the
grasping hand applies force to the handle. Action of a hand in
continual grasp with the handle of the apparatus can actuate
inflation, or release the flotation to a position spaced from the
hull, or both. After inflation, the flotation means of the
apparatus can be positioned to one side only of the hull of the



2069399
kayak, spaced from the hull, and moved by force exerted on the
handle in an arc of at least 90 degrees about the hull. According
to a still further aspect of the invention the apparatus may further
comprise a means for holding the inflatable flotation in relation to
the kayak.
The invention, as exemplified by a preferred embodiment, is
described with reference to the drawings in which:
Figures 1 through 7 are a series of sequential views showing
schematically the sequence of actions taken when using the invention
to right a capsized kayak;
Figure 8 is a side perspective view of the apparatus of the
invention in stowed condition on the deck of a kayak;
Figure 9 is a perspective view of the apparatus of the
invention pulled from its cover to expose the inflatable bag and
inflation mechanism;
Figure 10 is a perspective view of the apparatus shown in
Figure 9 after inflation of the bag;
Figure 11 is a perspective view from below, of the apparatus
shown in Figure 10, to display the underside of the inflated bag;
Figures 12, 13 and 14 are cross-sectional views of the
inflation mechanism in various operating positions taken along lines
XIII-XIII of Figure 15; and
Figure 15 is a cross-sectional view of the inflation
mechanism taken along lines XV-XV of Figure 13.
The method of the invention may be understood with reference
to Figures 1 through 7. Paddler 50 is seated in the kayak 21 with
skirt (not shown) in place. The surface of the water is indicated at
51. The paddler is provided with inflatable means for buoyant
_ 5 _



~~69399
support 24, preferably attached to the deck of the kayak in front of
the cockpit. The properties of a preferred embodiment of apparatus
24 are described below. In Figure 2 the kayak has capsized, with
the paddler upside down in the water but still in the boat. As shown
in Figure 3, to right himself the paddler first reaches for the
apparatus 24 and grasps its handle 25. Inflation of the apparatus
is then actuated in device-specific manner, and the paddler locates
the apparatus to one side of the kayak, spaced from the hull, as
pictured in Figure 4. The paddler then leans on handle 25 of the
buoyant support (Figure 5), thus generating the torque to rotate the
boat to an upright position (Figure 6) and sit up (Figure 7).
As will be apparent to those skilled in the art, various
modifications and adaptations of the method described above may be
made without departing from the spirit of the invention. If the
paddler were to retain hold of his/her paddle with one hand, while
grasping the handle of the apparatus with the other hand, upon
completion of the righting the functional equivalent of the skill-
requiring Eskimo roll would be accomplished, and the paddler and
kayak would be immediately seaworthy. If the provided apparatus
were to automatically inflate upon inversion of the kayak, or if
inflation were triggered by the paddler in a separate initial
action, it would be possible for inflation to precede the grasping
of the handle of the apparatus and the release of the apparatus,
from its place of securement, to a position spaced from the hull.
With reference to Figure 8, a kayak 21 has a cockpit 22 and a
deck 23. The apparatus of the invention is designated at 24 with
protruding handle 25. As shown in Figure 9, the components of
apparatus 24 are contained in hollow shell 26 and lid 27. Shell 26
is firmly secured to deck 23. Shell 26 and lid 27 close with a
watertight seal, to protect the contents from weathering agents such
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209399
as sunlight and salt water. In this embodiment, shell 26 and lid 27
are formed of a rigid plastic material or the like.
Handle 25 is connected through lid 27 to detonator block 28
and oral inflation nozzle 29. Detonator block 28 and nozzle 29, in
turn, are connected to inflatable bag 31. Pulling handle 25
separates lid 27 from shell 26 and slides out the inflatable bag and
its means of inflation.
Bag 31 is automatically inflated upon removal from shell 26
due to the action of slider 32 on gas cartridges 33, as explained
below using Figures 12 through 14. In normal operation slider 32 is
securely attached by tether 34 either to cover 26 or to boat deck
23, so that removal of bag 31 from cover 26 causes slider 32 to be
withdrawn from detonator block 28, thus discharging gas cartridges
33. Each cartridge communicates through a passageway in the
detonator block and a one-way valve with the interior of bag 31.
Oral inflation valve 29 can be opened or closed by rotation
of cap 30 either to deflate bag 31 after use, or to orally inflate
bag 31 to allow a person to rehearse aspects of the use of the
apparatus without expending cartridges, or to inflate bag 31 for use
as a re-entry aid should the cartridges become empty, or
inoperative.
Bag 31, shown in inflated condition in Figure 10, is an
airtight, waterproof, collapsible, flexible, cushion-shaped
container. Preferably, it is constructed of lightweight, durable,
and rot-resistant material such as MYLAR(TM). It has a volume of at
least one cubic foot, and preferably about two cubic feet, to
provide sufficient flotation when inflated. It is preferably secured
to the detonation mechanism around the gas outlet passageways 47
(Figure 15).
The operation of the preferred inflation mechanism can be
_ 7 _




2069399
best understood with reference to Figures 12, 13, 14 and 15. A
slider 32 has eye 38 at one end and lateral protrusion 39 at the
other end. Slider 32 is tethered by tether 34 from eye 38 to cover '
26 or boat deck 23. When detonator block 28 is pulled away from
cover 26, slider 32 is withdrawn along a slot 46 in detonator block
28. Shown in Figure 13, as the slider is withdrawn, slider
protrusion 39 causes ball-bearings 40 to move pistons 41 with
attached spikes 42 into puncturing contact with the seals 43 of
cartridges 33. As the slider is removed, gas and/or spring pressure
(see spring 35 shown by way of example in Figure 14) then forces
pistons 41 to the other end of chambers 44. See Figure 15. O-rings
45 prevent the gas from escaping out the slider slot 46. The gas
flows instead through passageways 47 and one-way valves 48 into bag
31. To be useful to an anxious capsized kayaker, whose head is
submerged, the inflation means should inflate the bag to an
operational volume of at least one cubic foot, and preferably about
two cubic feet, in less than ten seconds.
Some important features of the apparatus may be clearly
identified by reviewing Figures 2 through 7. In Figure 2 the kayak
has capsized, with the paddler upside down in the water but still in '
the boat. The paddler may be surprized, confused or disoriented.
Invention 24 is stowable in a conveniently accessible location, and
handle 25 is easy to locate and grasp. As shown in Figure 3, the
capsized paddler first reaches for the invention 24 and grasps
handle 25. He pulls the handle toward him, which slides bag 31 from
the shell. As the bag is removed from the cover, the slider is
withdrawn from the detonator block, which triggers the release of
gas from the cartridges as explained above with reference to Figures
12 through 14. Actuation is accomplished without requiring the
paddler to release his grasp or locate other features of the
_ g _



206399
apparatus or the boat. Operation is simple and "one-grab". Since
the paddler's head is submerged, inflation is non-oral and rapid.
Since the paddler may not have had a full breath at time of capsize
and the situation is stressful, inflation to operable size should
take place in under ten seconds, and more rapid inflation is
preferable. As shown in Figure 4, bag 31 then floats to the surface
of the water at one side of the boat. The bag must be movable to
one side of the boat because it is onesided buoyant force that
produces the torque for righting. The paddler then leans on the
floating bag (Figure 5), using handle 25 for gripping, rotates the
boat to the upright position (Figure 6), and sits up (Figure 7).
For efficiency in applying downward force to buoyant bag 31, the bag
is movable to a position spaced from the hull. The bag is easiest
to lean on when it is roughly the same distance from the hull as the
paddler~s shoulder. A bag volume of two cubic feet was found by
experimentation to provide a generous buoyant force for righting
even a large paddler in a loaded boat. Some smaller bag volumes are
functional, but may require that the bag be held at greater distance
from the hull in order to generate the required torque. As bag
volume decreases, the required skill level increases (due to a need
to reduce the torque requirement by using a "hip-flick" and other
Eskimo roll components) to the point where a volume of one cubic
foot is of little use as an aid to the righting process. Bag 31
must be movable in an arc about the long axis of the kayak hull. As
shown in Figures 4 through 6, the bag moves in an arc of
approximately 180 degrees. The flotation means of such an apparatus
must be movable in at least 90 degrees of arc, in which case the
inverted kayaker would raise the inflated bag directly overhead and
let the buoyant rise of the bag to the surface rotate the kayak
through the first 90 degrees of righting. The invention floats the
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269399
paddler's hand as high in the water as possible while downward force
is being applied to handle 25. To be effective, the apparatus must
float the paddler's hand at a depth less than an arm's length from
the surface. Therefore handle 25 is constructed so as to maintain
the paddler's hand in close proximity, less than one foot, to the
buoyant bag 31 while a downward force equal to the entire buoyant
force of the bag is applied. After righting, inflated bag 31 can be
deflated using valve 29 and stowed, or trailed in the water on a
tether while still inflated.
In the event that the paddler is forced to exit the boat,
whether due to accident, panic, or turbulence, the invention can
still be deployed and used to assist the paddler back into the boat.
Figure 11 shows pocket 36 on the underside of bag 31. A paddle blade
can be slid into pocket 36, so that the righting aid can be used as
a paddle float, in the manner of the prior art device described
above.
As will be apparent to those skilled in the art, various
modifications and adaptations of the apparatus described above may
be made without departing from the spirit of the invention, the
scope of which is to be construed in accordance with the
accompanying claims. while the invention has been described for use
in conjunction with kayaks, it will be apparent that it will also be
useful with covered canoes and related water craft. Also, while the
invention has been described as secured to the deck of the kayak, it
could obviously be held in, and used from, any readily accessible
place including any location or recess or pocket on the external
surface of the kayak, on the sprayskirt or spraydeck of the kayak,
or on the clothing or equipment worn by the paddler. For example,
shell 26 could be strapped to the deck, sprayskirt or other
equipment by means of grommets, straps, hook and pile fastener
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2069399
strips or the like. Shell 26 could be dispensed with completely if
the invention were constructed of sufficiently durable, weather and
water resistant materials. It should also be apparent that the
preinflation volume of the invention should be minimized to avoid
interference with routine operation of the kayak.
- 11 -

A single figure which represents the drawing illustrating the invention.

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Admin Status

Title Date
Forecasted Issue Date 2003-04-08
(22) Filed 1992-05-25
(41) Open to Public Inspection 1993-11-26
Examination Requested 2000-05-10
(45) Issued 2003-04-08
Lapsed 2009-05-25

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Filing $0.00 1992-05-25
Maintenance Fee - Application - New Act 2 1994-05-25 $50.00 1994-05-24
Maintenance Fee - Application - New Act 3 1995-05-25 $50.00 1995-05-24
Maintenance Fee - Application - New Act 4 1996-05-27 $50.00 1996-05-22
Maintenance Fee - Application - New Act 5 1997-05-26 $75.00 1997-05-23
Maintenance Fee - Application - New Act 6 1998-05-25 $75.00 1998-05-22
Maintenance Fee - Application - New Act 7 1999-05-25 $75.00 1999-05-21
Reinstatement - failure to request examination $200.00 2000-05-10
Request for Examination $200.00 2000-05-10
Maintenance Fee - Application - New Act 8 2000-05-25 $75.00 2000-05-10
Maintenance Fee - Application - New Act 9 2001-05-25 $75.00 2001-05-23
Maintenance Fee - Application - New Act 10 2002-05-27 $100.00 2002-05-22
Final $150.00 2003-01-15
Maintenance Fee - Patent - New Act 11 2003-05-26 $100.00 2003-05-26
Maintenance Fee - Patent - New Act 12 2004-05-25 $125.00 2004-05-25
Maintenance Fee - Patent - New Act 13 2005-05-25 $125.00 2005-05-24
Maintenance Fee - Patent - New Act 14 2006-05-25 $125.00 2006-05-24
Maintenance Fee - Patent - New Act 15 2007-05-25 $225.00 2007-09-20
Late payment fee under ss.3.1(1) 2007-10-06 $50.00 2007-09-20
Back Payment of Fees $225.00 2009-05-25
Current owners on record shown in alphabetical order.
Current Owners on Record
BLACHFORD, ALISTAIR MAITLAND
Past owners on record shown in alphabetical order.
Past Owners on Record
None
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.

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Cover Page 2003-03-04 1 36
Representative Drawing 2002-04-24 1 5
Description 1994-03-13 11 416
Drawings 1994-03-13 7 104
Abstract 1994-03-13 1 21
Claims 1994-03-13 6 176
Cover Page 1994-03-13 1 13
Representative Drawing 1999-03-09 1 9
Correspondence 2003-01-15 1 32
Fees 2003-05-26 1 26
Prosecution-Amendment 2000-05-10 2 53
Correspondence 2002-05-22 1 21
Correspondence 2002-06-18 1 15
Fees 2006-05-24 1 25
Fees 2002-05-22 1 33
Fees 1999-07-06 1 95
Fees 2001-05-23 1 30
Fees 1997-05-23 2 58
Fees 1997-06-30 2 120
Fees 1998-05-22 2 93
Fees 1999-05-21 1 30
Fees 2000-05-10 1 29
Fees 2004-05-25 1 28
Fees 2005-05-24 1 25
Correspondence 2007-08-08 1 21
Fees 2007-05-25 2 53
Fees 2007-09-20 1 31
Correspondence 2009-05-25 1 26
Fees 2009-05-25 1 26
Correspondence 2009-06-23 1 21
Fees 1996-05-22 2 59
Fees 1995-05-24 2 40
Fees 1994-05-24 1 29