US4247606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver oxide cell and its manufacture
Assignee: Maxell Ltd
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Filing: 1979-11-15
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Granted: 1981-01-27
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Expires: 1999-11-15
Abstract
Abstract A silver oxide cell which comprises a positive electrode comprising a shaped body of silver oxide as a main positive active material, a negative electrode and an alkaline electrolyte, characterized in that the shaped body is a molded product of a composition comprising particles of silver oxide and particles of manganese dioxide, both particles having a certain particle size distribution, so that a detectable voltage difference is produced prior to complete consumption of the discharge capacity of the cell, whereby the termination of the discharge capacity of the cell can be anticipated.
Inventors
- 👤 Yoshio Uetani
- 👤 Akio Shimizu
- 👤 Kozo Kajita
- 👤 Osamu Yumimoto
- 👤 Satoru Kuwano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:58
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/362; H01M4/364; H01M4/48; H01M4/54; H01M6/00; H01M6/04; H01M6/06; H01M6/12; H01M2004/026; H01M2004/028; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A primary silver oxide cell which comprises a positive electrode comprising a shaped body of silver oxide as a positive active material, a negative electrode comprising a negative active material and an alkaline electrolyte, characterized in that the shaped body is a molded product of a composition comprising particles of silver oxide and particles of manganese dioxide, the particle size distribution of both of said particles being not less than 90% of particles of not more than 10μ in particle size and not less than 60% of particles of not more than 5μ in particle size, and said shaped body having a packing density of not less than 4.5 g/cm 3 , whereby a detectable voltage difference is produced prior to complete consumption of the discharge capacity of the cell.
Claim 2
Dependent Claim
130 words
A primary silver oxide cell which comprises a positive electrode comprising a shaped body of silver oxide as a positive active material, a negative electrode comprising a negative active material and an alkaline electrolyte, characterized in that the shaped body is a molded product of a composition comprising particles of silver oxide and particles of manganese dioxide, the particle size distribution of both of said particles being not less than 90% of particles of not more than 10μ in particle size and not less than 60% of particles of not more than 5μ in particle size, and said shaped body having a packing density of not less than 4.5 g/cm 3 , whereby a detectable voltage difference is produced prior to complete consumption of the discharge capacity of the cell.
Claim 3
Dependent Claim
23 words
The silver oxide cell according to claim 1, wherein the main positive active material is silver(I) oxide or silver(II) oxide, or mixture thereof.
Claim 4
Dependent Claim
15 words
The silver oxide cell according to claim 1, wherein the negative active material is zinc.
Claim 5
Dependent Claim
29 words
The silver oxide cell according to claim 1, wherein the content of manganese dioxide is not more than 20% by weight based on the weight of the shaped body.
Claim 6
Dependent Claim
29 words
The silver oxide cell according to claim 4, wherein the content of manganese dioxide is not less than 1% by weight based on the weight of the shaped body.
Claim 7
Dependent Claim
29 words
The silver oxide cell according to claim 5, wherein the content of manganese dioxide is from 3 to 17% by weight based on the weight of the shaped body.
Claim 8
Dependent Claim
114 words
The silver oxide cell according to claim 1, wherein the weight proportion of the silver oxide, the manganese dioxide and zinc as the negative active material is controlled to satisfy the following two inequalities: [Zn].sub.min >[Ag.O].sub.max [Zn].sub.max <[Ag.O+MnO.sub.2 ].sub.min wherein [Zn] min is a minimum value in the variation of the discharge capacity of the zinc, [Zn] max is a maximum value in the variation of the discharge capacity of the zinc, [Ag.O] max is a maximum value in the variation of the discharge capacity of the silver oxide and [Ag.O+MnO 2 ] min is a minimum value in the variation of the total discharge capacity of the silver oxide and the manganese dioxide.
References Cited (Backward Citations)
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US3057942A
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US3170819A
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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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |