US3904437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separator for zinc chloride cells
Assignee: Edgewell Personal Care Brands LLC
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Filing: 1973-09-21
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Granted: 1975-09-09
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Expires: 1993-09-21
Abstract
Abstract A zinc chloride dry cell containing a separator comprising from about 5 to 30 per cent by weight of cross-linked polyacrylamide, and from about 70 to 95 per cent by weight of a mixture of talc and starch in a ratio of about 0.2 to 6.0 parts by weight of talc to 1.0 part by weight of starch.
Inventors
- 👤 Robert A Specker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:11
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A PRIMARY ZINC CHLORIDE DRY CELL COMPRISING A ZINC ANODE, A CATHODE DEPOLARIZER MIX CAKE CONTAINING MANGANESE DIOXIDE, A CARBONACEOUS CONDUCTIVE MATERIAL, AND AN ELECTROLYTE, AND A SEPARATOR INTERPOSED BETWEEN SAID ANODE AND SAID CATHODE DEPOLARIZER MIX AND ALSO CONTAINING A PORTION OF SAID ELECTROLYTE, SAID ELECTROLYTE CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION CONTAINING ZINC CHLORIDE, SAID SEPARATOR COMPRISING A PAPER SUBSTRATE, FROM ABOUT 5 TO 30 PER CENT BY WEIGHT OF CROSS-LINKED POLYACRYLAMIDE, COATED ON AT LEAST ONE SIDE OF SAID PAPER SUBSTRATE, SAID COATING INCLUDING FROM ABOUT 70 TO 95 PER CENT BY WEIGHT OF A MIXTURE OF TALC AND STARCH IN A RATIO OF ABOUT 0.2 TO 6.0 PARTS BY WEIGHT OF TALC TO 1.0 PART BY WEIGHT OF STACH, SAID CROSS-LINKED POLYACRYLAMIDE SERVING AS A BINDER OF STARCH, SAID CROSS-LINKED POLYACRYLAMIDE SERVING AS A BINDER FOR SAID MIXTURE OF TALC AND STARCH.
Claim 2
Dependent Claim
146 words
A PRIMARY ZINC CHLORIDE DRY CELL COMPRISING A ZINC ANODE, A CATHODE DEPOLARIZER MIX CAKE CONTAINING MANGANESE DIOXIDE, A CARBONACEOUS CONDUCTIVE MATERIAL, AND AN ELECTROLYTE, AND A SEPARATOR INTERPOSED BETWEEN SAID ANODE AND SAID CATHODE DEPOLARIZER MIX AND ALSO CONTAINING A PORTION OF SAID ELECTROLYTE, SAID ELECTROLYTE CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION CONTAINING ZINC CHLORIDE, SAID SEPARATOR COMPRISING A PAPER SUBSTRATE, FROM ABOUT 5 TO 30 PER CENT BY WEIGHT OF CROSS-LINKED POLYACRYLAMIDE, COATED ON AT LEAST ONE SIDE OF SAID PAPER SUBSTRATE, SAID COATING INCLUDING FROM ABOUT 70 TO 95 PER CENT BY WEIGHT OF A MIXTURE OF TALC AND STARCH IN A RATIO OF ABOUT 0.2 TO 6.0 PARTS BY WEIGHT OF TALC TO 1.0 PART BY WEIGHT OF STACH, SAID CROSS-LINKED POLYACRYLAMIDE SERVING AS A BINDER OF STARCH, SAID CROSS-LINKED POLYACRYLAMIDE SERVING AS A BINDER FOR SAID MIXTURE OF TALC AND STARCH.
Claim 3
Dependent Claim
46 words
A primary zinc chloride dry cell according to claim 1 wherein said starch is a cross-linked corn starch which has been etherified with an etherifying agent selected from the group consisting of ethylene oxide and propylene oxide to a degree of substitution of less than 0.2.
Claim 4
Dependent Claim
57 words
A primary zinc chloride dry cell according to claim 2 wherein said cross-linked polyacrylamide is present in said separator in an amount of about 8 per cent to 25 per cent by weight and wherein said mixture of talc and starch is present in an amount of about 75 per cent to 92 per cent by weight.
Claim 5
Dependent Claim
50 words
A primary zinc chloride dry cell according to claim 2 wherein said cross-linked polyacrylamide is present in said separator in an amount of about 12 to 22 per cent and wherein said mixture of talc and starch is present in an amount of 78 to 88 per cent by weight.
Claim 6
Dependent Claim
30 words
A primary zinc chloride dry cell according to claim 4 wherein the ratio of talc to starch is 1 to 3 parts talc to 1 part by weight of starch.
Claim 7
Dependent Claim
30 words
A zinc chloride primary dry cell according to claim 1 wherein said starch is cross-linked with a cross-linking agent selected from the group consisting of formalin, epichlorohydrin, urea and melamine.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |