Patent US3634138A successfully refreshed from Google Patents.
US3634138A
Expired / Lapsed
US
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Extended life secondary cells
Assignee: Wyeth Holdings LLC
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Filing: 1970-04-27
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Granted: 1972-01-11
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Expires: 1990-04-27
Abstract
Abstract The useful shelf and cycle life of secondary cells using a zinc anode, and a azobisformamide or substituted azobisformamide depolarizer is increased by coating the zinc with a small amount of a tetraalkylammonium salt, and/or increasing the content of ammonium chloride in the electrolyte above its solubility limit.
Inventors
- 👤 John Davidson Voorhies
- 👤 Mary Ellen Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:07
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M10/24; H01M6/00; H01M6/50; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
The cell of claim 1 in which the salt is methyl-tri-n-butylammonium iodide.
Claim 2
Dependent Claim
12 words
The cell of claim 1 in which the salt is ethyl-tri-n-butylammonium iodide.
References Cited (Backward Citations)
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US3285783A
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US3291645A
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US3357865A
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US3468708A
Cited
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US3565696A
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |