US4068049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline dry cell
Assignee: Toshiba Ray O Vac Co Ltd
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Filing: 1976-10-14
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Granted: 1978-01-10
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Expires: 1996-10-14
Abstract
Abstract A zinc-silver oxide dry cell comprises a zinc anode, a silver oxide cathode, an immobilized body interposed between the anode and the cathode, and a metallic silver layer formed at least on the anode side surface of the cathode by reduction of silver oxide. Reduction of the siver oxide to form the metallic cathode layer on the cathode surface is effected by causing a reducing agent to contact with the cathode surface or by subjecting the cathode surface to a heat treatment, electrolysis or a mechanical force.
Inventors
- 👤 Tadayuki Naruishi
- 👤 Youichi Kataoka
- 👤 Kazutaka Sue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
An alkaline dry cell comprising an anode containing zinc as an active ingredient; a cathode containing monovalent silver oxide as an active ingredient; an immobilized body of an alkaline electrolyte interposed between said anode and said cathode; and a metallic silver layer formed at least on the anode side surface of said cathode by reduction of silver oxide, the reduction being effected by causing a reducing agent to contact with the cathode.
Claim 2
Dependent Claim
72 words
An alkaline dry cell comprising an anode containing zinc as an active ingredient; a cathode containing monovalent silver oxide as an active ingredient; an immobilized body of an alkaline electrolyte interposed between said anode and said cathode; and a metallic silver layer formed at least on the anode side surface of said cathode by reduction of silver oxide, the reduction being effected by causing a reducing agent to contact with the cathode.
Claim 3
Dependent Claim
22 words
An alkaline dry cell according to claim 1 in which said reduction is effected by subjecting the cathode to a heat treatment.
Claim 4
Dependent Claim
25 words
An alkaline dry cell according to claim 1 in which said reducing agent is selected from the group consisting of hydrazine hydrate, formaline and hydroxylamine.
Claim 5
Dependent Claim
23 words
An alkaline dry cell according to claim 2, in which said heat treatment is effected at a temperature of 220° to 350° C.
Claim 6
Dependent Claim
32 words
An alkaline dry cell according to claim 4 in which said heat treatment is effected by one means selected from the group consisting of an electric heater, infrared ray and hot air.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |