Patent US3888700A successfully refreshed from Google Patents.
US3888700A
Expired / Lapsed
US
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Absorbent separator for an electric battery
Assignee: ESB Inc
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Filing: 1968-11-01
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Granted: 1975-06-10
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Expires: 1988-11-01
Abstract
Abstract An absorbent separator for an electric battery which comprises an elastomeric resin binder material (e.g. vinyl acetate-ethylene copolymer) blended with a gelling agent (e.g. starch, flour) which absorbs the battery electrolyte and immobilizes it in contact with the anode surface. This absorbent separator swells as it absorbs the battery electrolyte which improves the conductivity and helps to avoid selective corrosion of the anode surface. The absorbent separator, which may be self-supporting, has sufficient strength for use with automatic battery manufacturing machinery. When used in conventional Le Clanche primary batteries, these absorbent separators hold the battery discharge product in place and thereby help to prevent battery leakage.
Inventors
- 👤 Duane M Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:52
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/22; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/489; H01M50/429; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/5313; Y10T29/53135; Y10T29/53139
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
112 words
AN ELECTRIC BATTERY HAVING AN ANODE, A CATHODE MIX COMPRISING A DEPOLORIZER AND AN AQUEOUS ELECTROLYTE SOLUTION, AND AND ABSORBENT SEPARATOR SHEET MATERIAL BETWEEN SAID ANODE AND CATHODE, SAID ABSORBENT SEPARATOR CONSISTING ESSENTIALLY OF AN ELASTOMERIC RESIN BINDER FORMING A CONTINUOUS MATRIX BLENDED WITH A GELLING AGENT CAPABLE OF ABSORBING AND RETAINING BATTERY ELECTROLYTE, SAID ELASTOMERIC RESIN BINDER COMPRISING FROM ABOUT 10 TO ABOUT 30 PERCENT BY WEIGHT OF THE SEPARATOR WITH THE BALANCE BEING GELLING AGENT, SAID BINDER AND GELLING AGENT BEING DRY BLENDED WHEREBY THE GELLING AGENT IS NOT GELLED, AND SAID SEPARATOR BEING IN THE FORM OF A FILM HAVING A THICKNESS FROM ABOUT 3 TO ABOUT 15 MILS.
Claim 2
Dependent Claim
112 words
AN ELECTRIC BATTERY HAVING AN ANODE, A CATHODE MIX COMPRISING A DEPOLORIZER AND AN AQUEOUS ELECTROLYTE SOLUTION, AND AND ABSORBENT SEPARATOR SHEET MATERIAL BETWEEN SAID ANODE AND CATHODE, SAID ABSORBENT SEPARATOR CONSISTING ESSENTIALLY OF AN ELASTOMERIC RESIN BINDER FORMING A CONTINUOUS MATRIX BLENDED WITH A GELLING AGENT CAPABLE OF ABSORBING AND RETAINING BATTERY ELECTROLYTE, SAID ELASTOMERIC RESIN BINDER COMPRISING FROM ABOUT 10 TO ABOUT 30 PERCENT BY WEIGHT OF THE SEPARATOR WITH THE BALANCE BEING GELLING AGENT, SAID BINDER AND GELLING AGENT BEING DRY BLENDED WHEREBY THE GELLING AGENT IS NOT GELLED, AND SAID SEPARATOR BEING IN THE FORM OF A FILM HAVING A THICKNESS FROM ABOUT 3 TO ABOUT 15 MILS.
Claim 3
Dependent Claim
18 words
A battery in accordance with claim 1 in which the elastomeric resin binder is a vinyl acetate-ethylene copolymer.
Claim 4
Dependent Claim
29 words
A battery in accordance with claim 1 in which the elastomeric resin binder is a vinyl acetate-ethylene copolymer and the gelling agent is a mixture of starch and flour.
Claim 5
Dependent Claim
88 words
An electric battery having an anode, a cathode mix comprising a depolarizer and an aqueous electrolyte solution, and an absorbent separator sheet material between said anode and cathode, said separator consisting essentially of an elastomeric resin binder forming a continuous matrix blended with a gelling agent capable of absorbing and retaining said electrolyte, said elastomeric binder comprising from about 10 to about 30 percent by weight of the separator with the balance being gelling agent, and said gelling agent containing a liquid consisting of said aqueous electrolyte solution.
Claim 6
Dependent Claim
88 words
An electric battery having an anode, a cathode mix comprising a depolarizer and an aqueous electrolyte solution, and an absorbent separator sheet material between said anode and cathode, said separator consisting essentially of an elastomeric resin binder forming a continuous matrix blended with a gelling agent capable of absorbing and retaining said electrolyte, said elastomeric binder comprising from about 10 to about 30 percent by weight of the separator with the balance being gelling agent, and said gelling agent containing a liquid consisting of said aqueous electrolyte solution.
Claim 7
Dependent Claim
18 words
A battery in accordance with claim 4 in which the elastomeric resin binder is a vinyl acetate-ethylene copolymer.
Claim 8
Dependent Claim
29 words
A battery in accordance with claim 4 in which the elastomeric resin binder is a vinyl acetate-ethylene copolymer and the gelling agent is a mixture of starch and flour.
Claim 9
Dependent Claim
15 words
A battery in accordance with claim 4 in which the depolarizer is an azodicarbonamide compound.
Claim 10
Dependent Claim
18 words
A battery in accordance with claim 7 in which the elastomeric resin binder is a vinyl acetate-ethylene copolymer.
Claim 11
Dependent Claim
80 words
A dry cell comprising a zinc casing serving as a negative electrode, a cathodic mixture disposed in said zinc casing, separator interposed between said zinc casing and said cathodic mixture and an electrolyte retained by said separator, said separator being composed of a paste powder and thermoplastic resin particles, said thermoplastic resin particles being bonded to each other to form a net structure adapted to retain said paste powder therein and said paste powder being gelatinized to retain said electrolyte.
Claim 12
Dependent Claim
80 words
A dry cell comprising a zinc casing serving as a negative electrode, a cathodic mixture disposed in said zinc casing, separator interposed between said zinc casing and said cathodic mixture and an electrolyte retained by said separator, said separator being composed of a paste powder and thermoplastic resin particles, said thermoplastic resin particles being bonded to each other to form a net structure adapted to retain said paste powder therein and said paste powder being gelatinized to retain said electrolyte.
Claim 13
Dependent Claim
27 words
A dry cell according to claim 9 wherein said paste powder consists of at least one of cellulose derivitive powder, synthetic paste powder and processed starch powder.
Claim 14
Dependent Claim
22 words
A dry cell according to claim 9, wherein said thermoplastic resin consists of at least one of polyethylene and polyethylene-polyvinyl acetate copolymer.
Claim 15
Dependent Claim
38 words
A dry cell according to claim 9, wherein said mixture to form the separator is composed of 70 to 90 parts by weight of the paste powder and 30 to 10 parts by weight of the thermoplastic resin.
Claim 16
Dependent Claim
33 words
A dry cell according to claim 9 wherein a second electrolyte absorbing powder is added to said mixture of the paste powder and the thermoplastic resin used for the formation of a sEparator.
Claim 17
Dependent Claim
62 words
A method of producing the dry cell according to claim 9, including the steps of heating the mixture of the paste powder and the thermoplastic resin to form a film of net structure, retaining the paste particles in the meshes of the net structure, lining the inside of the zinc casing with said film, and gelatinizing said paste powder with said electrolyte.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |