US3990916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver oxide cell
Assignee: Seiko Instruments Inc
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Filing: 1974-12-26
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Granted: 1976-11-09
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Expires: 1994-12-26
Abstract
Abstract Disclosed is a divalent silver oxide cell having amorphous carbon and a current collector in the positive active material. Amorphous carbon is useful for quickly dropping the high voltage of the AgO which appears at the initiation of discharge to a lower constant voltage level. The current collector which is disposed in the positive active material reduces the internal resistance of the cell when operating at low ambient temperatures including room temperature.
Inventors
- 👤 Kouichi Sugimoto
- 👤 Tsugio Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; H01M4/36; H01M4/48; H01M4/54; H01M6/00; H01M6/04; H01M6/06; H01M6/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A silver oxide cell of substantially constant discharge voltage comprising, negative active material of amalgamated zinc, an alkaline electrolyte, a body of positive-active material comprising divalent silver oxide and amorphous activated carbon, separator means intervening between said negative active material and said positive active material and comprising an alkaline electrolyte-absorbant layer and a semipermeable cellophane layer, and an alkali-resistant electrolyte-inert metallic current collector which is inserted within and in electroconductive contact with said body of positive-active material.
Claim 2
Dependent Claim
77 words
A silver oxide cell of substantially constant discharge voltage comprising, negative active material of amalgamated zinc, an alkaline electrolyte, a body of positive-active material comprising divalent silver oxide and amorphous activated carbon, separator means intervening between said negative active material and said positive active material and comprising an alkaline electrolyte-absorbant layer and a semipermeable cellophane layer, and an alkali-resistant electrolyte-inert metallic current collector which is inserted within and in electroconductive contact with said body of positive-active material.
Claim 3
Dependent Claim
37 words
The silver oxide cell according to claim 1, wherein said divalent silver oxide and amorphous activated carbon are mixed uniformly, and the amount of said amorphous carbon is less than two weight percent of said silver oxide.
Claim 4
Dependent Claim
32 words
The silver oxide cell according to claim 1, wherein said amorphous activated carbon is one or more amorphous carbons selected from the group consisting of activated carbon, charcoal, carbon black or cokes.
Claim 5
Dependent Claim
27 words
The silver oxide cell according to claim 1, wherein said current collector comprises an alkali-resistant electrolyte-inert conductive metal net within the body of said positive acting material.
Claim 6
Dependent Claim
62 words
The silver oxide cell according to claim 1, wherein the quantity of activated carbon is the range from 0.5-2.0 weight percent against said divalent silver oxide, and the electrolyte essentially consists of an aqueous solution of 30-40 weight percent of sodium hydroxide or potasium hydroxide, saturated with zinc oxide, and the negative-active material is zinc, amalgamated with ten weight percent of mercury.
Claim 7
Dependent Claim
32 words
The silver oxide cell according to claim 1, wherein said current collector comprises a pair of conductive plates having a plurality of conductive pins penetrating into the body of said positive-active material.
Claim 8
Dependent Claim
39 words
The silver oxide cell according to claim 1, wherein said current collector comprises a plurality of conductive plates which are conductively fastened to and raised from the bottom of the cathode can into the body of said positive-active material.
References Cited (Backward Citations)
US2829186A
Cited
US3245837A
Cited
US3442709A
Cited
US3496018A
Cited
US3530496A
Cited
US3485672A
Cited
US3615859A
Cited
US3634142A
Cited
US3655450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |