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Patent 2050071 Summary

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(12) Patent Application: (11) CA 2050071
(54) English Title: ELECTRONIC VOLTAGE- AND TEMPERATURE-REGULATED BATTERY-HEATER
(54) French Title: CHAUFFE-BATTERIE ELECTRONIQUE A REGULATION DE TENSION ET DE TEMPERATURE
Status: Dead
Bibliographic Data
(51) International Patent Classification (IPC):
  • H01M 10/6571 (2014.01)
  • H02J 7/00 (2006.01)
  • H05B 1/02 (2006.01)
(72) Inventors :
  • BEHNISCH, JURGEN (Germany)
  • BEHNISCH, JURGEN (Germany)
(73) Owners :
  • BEHNISCH, JURGEN (Not Available)
  • BEHNISCH, JURGEN (Not Available)
(71) Applicants :
(74) Agent: MARKS & CLERK
(74) Associate agent:
(45) Issued:
(22) Filed Date: 1991-08-27
(41) Open to Public Inspection: 1992-03-01
Availability of licence: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): No

(30) Application Priority Data:
Application No. Country/Territory Date
P 40 27 149.8 Germany 1990-08-28

Abstracts

English Abstract



ABSTRACT OF THE DISCLOSURE
This battery heater allows every battery independent of position (i.e.automobile load accumulator) to be heated up without ant external power
sourco, and to improve the starting power while external temperature is low.
The circuit is constructed in such a way that an internal temperature below
0° C in the battery is prevented for a long period of time, and that a
regular internal temperature of ca. 15° C in the battery is accomplished in
most cases. In case the battery heater is switched on for a longer period of
time, and the battery voltage drops below 12 V the battery heater will shift
down to a minimal current of ca. 8 mA which is discharging the battery
rather insignificantly. The battery heater functions maintenance-free,
without any mechanical switches, and is only activated by a starter voltage
of ca 14 V, in order not to influence the storage of the filled battery.
The durability of lead accumulator is, when using the battery heater,
prolonged due to the constant internal temperature, because at the same time
the development of lead sulfate (Pb SO4) in too large crystals is prevented
or delayed in most cases.

In an electronically heated automobile starter battery the
same Ah starting power i accomplished as in a battery of a
size ca. 25 % bigger. This way the battery size can be
reduced, and the enviroment is being charged with less lead
acid waste.


Claims

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




THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:



1. Electronic voltage- and temperature-regulated battery heater composed
of an electronic control on a soldering platine (9) and four power
transistors (16) installed on an aluminium plate (17) which is serving
as a cooling sheet, and which is heated up by the four power
transistors through their current flow.

The voltage required is being gotten directly from the plus-pole (12)
and the minus-Pole (13) of the battery to be heated through the two
connecting wire (6) with attached connecting rings (7, 8). The
complete circuit entity is welded acid-proof in a foil (10), and is
suspended in the interior (14) of the battery (15). Thereby, providing
a 12 V voltage at the battery electronics and an external battery
temperature below 15 ° C, the electrolyte and the active mass in the
battery are heated up electronically, voltage- and
temperature-regulated.


2. Electronic voltage- and temperature-regulated battery heater in
accordance with patent claim 1, characterized by the fact that the
electronic control for the four power transistors (16) consists of two
different-working temperature-regulators, one battery voltage control
unit, and one fuse circuit,




3. Electronic voltage- and temperature-regulated battery heater in
accordance with patent claim 2, characterized by the fact that the fuse
circuit blocks the temperature control circuits by providing a minus
voltages (3), and that the built-in fuse is damaged at ca. 14 V and
thereafter discontinues to block the temperature circuit.


4. Electronic voltage- and temperature-regulated battery heater in
accordance with patent claim 1, characterized by the fact that, instead
of the power transistors (16) which serve as a heater, one single power
transistor with similar development of heat is installed, or that a
heating foil, a heating wire or a peletier element are approched via a
circuit transistor.


5. Electronic voltage- and temperature-regulated battery heater in
accordance with patent claim 1, characterized by the fact that the
aluminium plate (17) with the heating and control electronics supplied
with a plastic cover are installed on the exterior of the battery or
directly built into the battery case.


6. Electronis voltage- and temperature-regulated battery heater in
accordance with patent claim 1, characterized by the fact that the
entire control circuit, or parts of it, are combined for the battery
heater in an integrated circuit (IC), and that hereby the production of
battery heating electonics is simplified substantially.



7. Electronic voltage- and temperature-regulated battery heater in
accordance with patent claim 1, characterized by the fact that by the
electronically regulated battery heater the battery is heating up in
such a way that, at an external temperature of ca. 0° C, it produces an
internal temperature of ca. 15° C, and herewith possesses approximately
the same Ah starting power as a battery of a size ca. 25 % bigger, and
thereby requires a lower amount of lead and acid in the battery.

Description

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


23. 08. 91 12:11 KESSEL U. BoHME D-2500 NuRNBE~G S. 04
20~0a7.~

-- 1 --


Electrt~nic vo~t~- and t~r~r~i1;u~-r~latt3d battc~h~ r


The illv~lltic~n ~i r~ rel2~t:.in~3 to ~ir~ t,!leCt.rt~niC bc~l:t~ry he~to~r~ rec3~,ilal:ed by
vt:~lt.r-~t,~e a~nd tt~u^~iture (hererafter ~of<~rre.t~ t.t~ as ba~Lery heatt1r) ~irld is
Fx~sed to }~3 u.~n.cl nlal n.l.y ~ r lZ V autr~ilc.~ l.t-~ad act~llaLors ( st~-i,^tt.~r
b~it.t.~r i c~

e l~t.t~ry ht~ r enahles the mnintcnric~e t~f a gtx)d nrnnint~ temp~r.-lt-~o ft r
Lhe bi-1ttcr.~y e.vet) in case of low ~xt~rnal t;t~erat.ure, by n~ang of ~ at;nc~
o10JIK!rlt supplied by the l~att.er~ i~self and of t.~ ff i l~i ~it.etJi eJ.e.ctronic
cont:rol.

It i,s a known f.~t.~,t. t.h~it. t.he possible ~t.rain ~n tht? t~-~enL is irr~t~vc~d
clis~.inct..ly ~ ht~atin~ up tho e.lnct~olytc~, and the at-~l:ive, ~s~ t~al~;e the
illllC`X ~ t.t.t~ry ~ ist~ncc i~ ~r when heated ~Int~ t~u~; t.ht~ l fl ~arLin~
~a~ucity i:i imf)~:~ed greatly. l.ikc~wise, an ~utc~n~lile st~rt~.cr b~3ttory t.hat
i3 alrc.~ady ~ d l~p will be r~cl~a~qc~tl n~uch rasl:~?r and will reyai~ t-ho
desirc~ ;cit~ne~y in a v~ry .~;hort. peri.c~

In t.tl~ ~)as~ drivers have ~cn Inissing a b~Ltery which ~clju~ts ~3ut.c~rnat.icc~lly
I.h~ surrouncliny ten3~erature, c~nd which ~3t~ l ic:ht~s. tht? adv~nl:ages
n~JIt.i~llt~d beC~re.

A c~.~ri~s of patent~ have b~:en re~;isLered en~a~inq irl warn~ p the h.ai:tery
wililc :;tarldin~. It is known for ex~ DF.-P.~ 647 003) ~o provid~ ~x~t.i~lcl
oltYI~ol~t.:~ ;n Ih~? battery C~irl~l which are s~lppliced with ~urr~nt hy 1:he
~tt~ y itst31f.

23. 08. 91 12:11 KESSEL U. BoH~E D-8500 NuRNBERG S. 05
7 :~

-- 2 --


L)~ 2~12~76 A1: A heatin~ element with a lar~ r3~ace cc~v~rin~ t.h e~t.~rior
of t.h~ k~c~ttcry ~n~ boirl~ rcyulcltc(~ ~y cl t.hcnmo switch.

US~ 2 ~2~ 97:L: An I,-~hap~.d h~ ti~ lement. on which t.he p~tery is placed
utxtl in or~er to he waLn~.d up, ~nd which is~ also suppli~d wil.h elecLr1ciLy
'c)y t.~le h~t.t..r.y i~t~olf.

~ GB-rs ~94 555: A th~Lmic~lly ccan?lctely i~ol~t.ed ~tt~3~ with ~ hea~in~
el~mK~n~ pr.ovidin~ at. tho }~tt.c~n ~ncl ~ thcr~o ~witc-h ~t. t.h~ 3idc~..

US ~S ~ 440 109: H~atin~ elements s~bmer~ed il-tO the el~qtrv.l,~te, SUF~)J..i~~y ~ tt.~ y vc~lt~y~.

L 77L 073; A hoatit~g ~lc!~;ice or coll~c.tor batt~r:les ~.ither wlth a
t.r.ouqh ~ nt.~in;ng t.h~ batt.~ry or wi.t.h a co.l.lar arol3lld l-he ballely, in each
sc ~t~ lo.~ t.~.) ~i~]rf~ s ~ith~r ~:E th~ trouc3h or Or the collar .~Le ~eate~
~E~

D~ 3~33309 Al: A heat-storin~ tran~i~tor h~atirlg ~vicc ~r~fin~ to
q~st.;.qtlt acc~mulAtors ~nd heated up ~y the. t.rc~nsist.or'i;i w~m~.h.

~se kn~l devices show nui.~erous d~fi~ienCici~ c~ci~.~;iiv~ draw.i~ rc~
I.h~ baLLery that is actually ~uppvY~d to ~ hec~t~ u~, arl~ Inissitlc3
~lr~:t.forlic~ ~)rlne~t.ions ~o rec~j3llize when the automobile is bein~ started or
wh~n il: i.s shut down for a longer period of tim~.




,~

23. E~8. 91 12:12 KESSEL U. ~i~Hi~1E D-8~;00 NuRNBERG S. 06
~0~07~
-- 3 -- ~:


Likt~.wi~3c, proLect.io~ lectron:ic~ rc missinc.3 whicll act.i~/atc the bat.l~ yhcc~tincJ o~fly ~hcn firsl: ~;t~t~iny Lhe tlut.omobile, .in order t~ prn.venL
b~t~t.~ri~ on ~;tcK~k, filled w.il~ cid ~Tmd chargcd, frc~m l~ing heatecl ~Ip inth~t ~t~ge.

~ome c~l t.hc.~e pa~ents or re~isLrati.on:~ c:over tho largesL ~rt. of l~he hst.t~ry
ca~e wi th thc~ir heaLi.ng .~urface: th~ i the.y }~r~cnt a rapi~ c.~x~li.ng ~ t~s~art.er h~t.te~ry when thc~ engine ;s nmning or ~)ut.~ide L~?l^~t.ures ~-e high.
lhis pr.~e.Y~Ir.~ s hannful for the Ah alLput~ a!i the e'rll~c~t. of ta~ muGh
~.olciness . - . .

All Lh~se kno~l b~t Le~y hc~tincJ devi ~c~ were not ~hlt Lo suc c~t.~cd on Lhe
mclrke 1. .

T~crefore, t.hc~ :;ubj~ct o~` t.ht` invenl:ion i !; to cr~?ato ~1 elect~ronic;
t.cn~eraLure-rc~cJu1ated batt.~ry tleater (bat.t.ery h~at:er) lNttich can ~x~ in~italled
irl C~lstoma~y C~t~rt.cr bctt~er.i~s ~lrec~cly on t.hc market, Withoul:: aJ,terirlt3 the
ba~Lt~ry ca~;ing, At t.ht~ ne ~imf:, t.hc w~rming up of L]le }~t.t,c~ry sho~3.l~ t~kc
~lc1ce wiLh t.ll~ ~',east possiblc.~ power con~ tion and t~c~ b~s~ pt~ it~lc decJree
of eLfe~ctivr-~rlt~s, c~cl shl.~uld ~11 a~ or~c be ~1~? ~.n rec~o~nize all s~.~ges irl
W}l i l~l the warmirlc,~ up of ~h~ b~t.tory is n~c~.~f;~: y wiLh~ t h~ving L~ !;e a
mechan;.G switc~h.

Mort~over, the )~atter~ hcatinq is ~t~t c;upposed to ~ iv~'Led ir, filled and
c~h.arc3e~1 batteries which Ar.o on salt~, t:~ut only aftt~ t~}3 fi.rfit. C:t.flrtin~
~)rc~ec~lr~7 of tht~ flutarol~ile. Thi~; w~y, Lh~ h~t.t.er~ volt~ag~ is kopL con~t~nt
over a longer r~riocl of l:in~ ncl the startin~ rt3,sult is ~ffecL~d rat.h~r
insiqnif :i cantly .

'lhe inverltion as charfl~tf rized in titles 1 tc~ 7 i~ solvi.r~ t.ho prob.leY;I~c;
E~rt!~ nt~7cl by mearl~: of four ~ff icien- ~ran~; j c;to~s; ~hey ~.ro fixed on an

23.~ .~1 12:12 KESSEL U. BoHME D-~500 NuRNBE~G
--4--

al~ini~un p~.~to ~nd, accordirl~ to requirenlcllt, t:h~y ~ar) }ie cal.l.e~j o~ }~y
m~ ~f an ele~t.ron:i.c ~witch.

e heat. t~c~ncr~t.~l hy c~Jllin~ ~I.r ~he efficien~ ~ransistors is diverted ~vcrt.ll~ a.l.~minium plate and t.hus he~t..~; up tho ~lc~t~ol.yt.~ ant~ t.he ac~lve mass
i.nside the battc~y. M~chanic ~w~tche~ are n~t: need~d h~re. 'l'he electronic
c~rlrl~t.~on Cuncl.i~ns with a volta~e of 1~ V cmd it c;-m be dir~.ctly fix~ n
the ~).Lus-pole and the minus-pole of the b~ttery. ~le. power ~on~ptlon
~tK~nts to ca. ~50 r~ per hour.s when tempera~ures ~re higher than 0~ C; when
t~t~raturo~ ar~ kolow 0 C, t~lo cons~nption am~untC. to ~a. SOO t.o l,SOO mA
~er ho~r, de.pe.ndin~ on the outside temper;~t.ur~ (for e~ le at -30 C:
1.500 mA per hour).

'111e co~mectin~ electronics and the he~tinq electrollic.s are welded in c~

~on~truct;ion h~ ht t~ the eJ.e~tronics ~ c)~ the ef~.i.c.i~ . trar~.i.stors th~
welded c.onstr~l~t.ion c~lc~t~nt..~ w.i.t.h thc al~inium E~ t.o c..-~n ~ laec~ i.n t.tlO
~idc~e of t~lC ~tt~.cy, ~xetw~rl ~ctiv~ Inass ar~cl el~.ckr~l,yte, wi.t.hout ha~.in~
to takc u~ ~y ~lLeraLion in Lhe construction of Lhe baLLery. 'l`he 1~ V
<ormeC~tiOrl of the elec~ronics is bein-~ pluc~Jed inLo Lhe l?lus-l?ole and Lhe
minu~-pol~ o~ ~hc battery t~.i.t.h tw~ .~asten.inc~ rin~C. be~ore th~! cover is
cJ~e~ ti~htly in tlle baLLery prodhlction plant.. 'lhe ele~tronic voltAy~- and
tenporaturc-r~yulate~ battery heat,er is ~lerea~te~ funcLiollinc3mainten~rlce-fre~ an~ act.ivatitlq itself accordill~ ~o rt~luiremenL.

Thr ~hlr`2bil.it~ ~f a lead accl~mlla~or is exLended by usiny Lhe b~L.~ery heater
because of thr~ corl~tant lnt.errlal temperature~ for aL Lhe s~ne tIme thc
constit.ution of leac3 s~J,~ate (PB .504) in Loo larcJe crysLals i~ preven~ed or~ay~d in ll~St cases. q'herefore. no pr.obl~.~rl~: ~ct~ t~ ~x~ ~r~c~ct~d when llSillg
~he autcn~bil~ r~ula~ly, not ~.v~n i.n the case ~f lowest t-emper~tur~

23. 08. 91 12:13 KESSEL U. BoHl~lE D-8500 Nul~N~El~G S. 08
2 ~ 7 ~
Fl.lr~t.hor ~i~tails ~ld aclvc~nt~es of th~ irlvcntiorl ~sul t form the s~b-claim5
i.n relaLion with thc dcscripti.orl of pCr~ormance ex~ les which are explain~.d
in ~ trll by illustr~:cion~.


C.h~win~:




E'l~ct:ronic connection wit.h cu~t~na.~y const.ru~t..ioll parts.


I;'i(3. 2: ~Ht.t.~.ry ca.sin~ wiLhout cover wit}l inserLed hcat.itl~ devicc.


Fiq. 3: ~eal~ clcctronics r~ady to ~c ~ ugc~ed in ~nd w~lded irl acid-proof
Loil.




Fi~. 1 shows lhe canplet.e electroni.s circuit, consistirl~3 o~ tran~i~tor
ht-at.11l~, fir~t and ~ccond t:er~pe.ratur.e control, bat.tery volt.~e conLrol unit:,
all~t ~usc ~.lect~ollics. The circuit is constru~:t.~d by means ot cusLc~ary
el~.~Lro~ el~ment.s ~n~l it: c.an ~ r~onstructcd by ~ exp~rt. ~t any timc.


r~hc~ cir~uit ~.h~ws clear:ly how t.he .[irst ~nci s~.cond t~ly?er~Lur~. cc~nt.rol
respon~.~ to ~at~h fl;.~i~erent. rcsi6Lancc value c~nd how t~ powcr fu~;e T4 t I ) is
.swit~h i n~ at diferent ten1peraturcs O Illis is t.,~k;.ng pl~cc a~ thc 1 1.rsl: .

ternper.lt.urc coIll::rol, ~st ca. 15 C, and at. t.h~ second t~ ~.rature c~nt~rol, ~t.
~a. 5" C. Hereby, ~t. the first. t:emper~ture contl-ol, ~ swil:~hir1q ~lrrent of
ca. 600 mA fl-w~ (by isrpulse) lhrc)~ h t.ransistor Tl ~:o '1'4, and at t.}ic ~econd
t..~:yIlF~r~t:urc cont~ witc~hirlt3 current~ Or ca. l~500 ~ th~out~h ~xansistor
Tl Lo T4, lik~wi:~e by i~7pulsc. ~:~


This w~yt l;he Nq~ rcsi~Ctor evicl~ t.i.n thc: fir.st ~c~ ralur.~ nLrol
(thennist~) (2) r~ulal:es t~IC star~int3 ~hJration of the tempe.rat.I~re cont.:ro.I.s
by cha~int3 the resist~ncP. v~lucs so that: t.he tr~nsi~t.~>rs T1 t~o 'ï4 ~rc
sclc~:t~d merc].y by impulse, ~ cr~ing l;o tt~c existint3 t~xternal t.~mper.-1tu~
.and t.~ t.h~ volu~nc c:t the hfltter~ m~ss to be hc~t.~.d.


23. 08. gl 12:13 KESSEL U. BoH~lE D-~350~ Nu~N~ERG S. 0g
- 2 ~ 7 i




Tllc,~ bc~tLery volt~ge control ~n~it. swi~che.~ one mi~lu-pole nntn the
ten~!r~rAtur~ c~nt.rcll eiLh~r at ~ Vo~t~cJc~ ~el~w l~ V or at an overvolta~o.
h.i.c,lht~r.~ thtm 13,:1 V and pr~ c~rlt.~ ~h~ir r~3~on~ hi~ way t.hc~ tran~i.C.;tors '~'l
~.c) T4 c~nnot t~ ac~ivat:c~l, and t,hoy rema1~1 clc~eller4lzed. B~t if the battery
voll.a~n applie~ tc~ the C:iXC~Iit. amOUrlt~ to 12 up to 1~,.3 V (r~Ygular h~t.tcry
volt~a~o) ~he h~t~tery voltage ~or~t.rol unit does not swit-.c~h a mil~u:~-pol~.(3)
ont.~ the l:em~rclture c~ntrols an~ they ~a react, a--cor~in~ k~ t.~o inLerrlall~ttery t~nporc~ture.

In c)r~l~r not t,.c~ ac~ivat.l~ t.he b~tt,~ry h~at.in~ wtl~.n t~cc b~att~ry i~ ~illc~cl ancl
~h~rqed al: t.h~3 s~ore or Lhe. ~areho~s, ,~ min~ls-pole 3 ~ wi-chetl c)rlto the
h~ttery ~c)lta~e ~nt~.ol un.it. ovor th~ ;nta~t ~'ujo ele~t.ror~ s; ~hi3 way h
res~orl.t.:e of the transist.c)r~ ~rl ~o ~4 is pxe.v~nLe~. W~lon ~he ~tarL~r b~t.t~oJy
i.F; Fi~ t bui..l~. i.nto ~1 autc~b; l.c~ and the ~.tarLin~ ~roce~3~Jro i~ rele~ d a
vol~a~e of c~.. . L4 V ~ ~ ~ct on t.he bc~tery v~ c~ onl;rol Cir~:llit ~y t:ht?
c3~nf~rc~or. Tht:~ hctl:t:ery volLa~ ~ffecl:s t.he t.r~ulsi~tor T5 (') allcl ~slslet~t:F; it.
t.hrou~ h~r~by a switch;.n~ cnrrent Or ca. 300 n7~ flws th.rouqll tho fuse
(4) .7r~ destro~y.c.i it. Thc desl.l~y~.~l fuse (4) canrtc>t sel c minu~ b.l~king
vol t.~ 4c ont:o th~. battcry ~ l.t.~lye corltrol Utlit any lon~x . N~7w t~ e
tA.~7eratu:~ ontrol ccm r~.~pond indc~.EK3~dently if r~li.red i~ the .r.eyular
vol~:.c.t~3e r~r7g~ J.2 to 13,:3 V) at any ~in~!.

With an ;nta~ .f.use (4) th~ .tttery hcatin~ cle.ctr~nic~!.; only take a m;rlimal
ctir.rorlt of ca. ~ mA which .i F; ~ffecl: in4 t.hc ~to~ili.ty of Lh~ r i.lled and
~harc~fl ~Ht.tery 3cather ~nF;ignificantly.




~ ' :': ., ~` : `

23. 08. 91 12:1~ KESSEL U. BoH~E D-8500 I~luRNBERG S. 10
- 2 ~




~it3 ~ show~c; how t.hc olcctronic baLt~ry ~.o~ltrol ~nd the ~ran.~ t~)r. T4 (.L) as
~L.l ~ the transisLor~ Tl t~ T3 are gl~le~ c~ ~h~nic~lly .~.ix~d ont.o ~n
~l~un.i.rlium pl~te (ca~ 80 x 13t) x :I. mm). The t.~o ~onnec~in~J pole~ (fi) ~r~
t.r~rl~lT~itt~d upw~cls l-c thc~ polc col~ecl:.~n~ .r.inc3s ~7, 8) l-~.rQuqh ~ i~ol~ed
wire ~r Ar~ isolat.c~ m~ il. Thc ~witch p.lat.itlc ~C~I. 40 x 7n x 1 mn) (9)
wi~h ~he c~lumlniwn plclte (17) ic w~ld~d acid-pr~f in a foil ~so th~t
h,~ery llec~tirl~ Gi.~it. ~1 be ~ubll~rqcd i.nt.o ~he electrolytc.

. 3 shows how t~ hattery he~ter i~ pushed in t.hc middle o~ the battery
.sc (15) cmd connectefl t.o t.~c plus-pol~ (12) and to lhe rl~irlui-pole (13).




.: : . .: ; ~:: . . ~ :

. .. ;~. , : : . ,,: .~ ~. . :

Representative Drawing

Sorry, the representative drawing for patent document number 2050071 was not found.

Administrative Status

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.

Administrative Status

Title Date
Forecasted Issue Date Unavailable
(22) Filed 1991-08-27
(41) Open to Public Inspection 1992-03-01
Dead Application 1994-02-28

Abandonment History

There is no abandonment history.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Application Fee $0.00 1991-08-27
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
BEHNISCH, JURGEN
BEHNISCH, JURGEN
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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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Drawings 1992-03-01 2 193
Claims 1992-03-01 3 109
Abstract 1992-03-01 1 46
Cover Page 1992-03-01 1 27
Description 1992-03-01 7 296