Patent US4238555A successfully refreshed from Google Patents.
US4238555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak-proof alkaline cell and its production
Assignee: Maxell Ltd
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Filing: 1979-07-10
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Granted: 1980-12-09
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Expires: 1999-07-10
Abstract
Abstract A leak-proof alkaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can and the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with a copper layer which is adapted to be contacted with a negative electrode active material mix and the copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of the turned-up portion.
Inventors
- 👤 Yoshio Uetani
- 👤 Yasuyoshi Taniguchi
- 👤 Kenichi Yokoyama
- 👤 Seiichi Matsushima
- 👤 Sonae Kirihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:42
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/12; H01M50/00; H01M50/10; H01M50/147; H01M50/166; H01M50/167; H01M50/171; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A leak-proof aklaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can and the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with the copper layer which is adapted to be contacted with a negative electrode active material mix and said copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of said turned-up portion.
Claim 2
Dependent Claim
119 words
A leak-proof aklaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can and the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with the copper layer which is adapted to be contacted with a negative electrode active material mix and said copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of said turned-up portion.
Claim 3
Dependent Claim
15 words
The cell according to claim 1, wherein the metal plate is a stainless steel plate.
Claim 4
Dependent Claim
27 words
The cell according to claim 2, wherein the negative cap is made of a clad plate comprising a stainless steel plate and a copper layer attached thereto.
Claim 5
Dependent Claim
36 words
The cell according to any of claims 1 to 3, wherein the ultimate terminal edge on the turned-up portion is outwardly projected to make a burr and the burr has an acute angle at the top.
Claim 6
Dependent Claim
17 words
The cell according to claim 4, wherein the copper layer is tapered near the ultimate terminal edge.
Claim 7
Dependent Claim
18 words
The cell according to claim 5, wherein the elimination of the copper layer is effected by chemical polishing.
Claim 8
Dependent Claim
22 words
The cell according to claim 6, wherein the chemical polishing is carried out by the use of a solution comprising hydrogen peroxide.
Claim 9
Dependent Claim
130 words
A leak-proof alkaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with a copper layer which is adapted to be contacted with a negative electrode active material mix and said copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of said turned-up portion and the copper layer is tapered nearly to the ultimate terminal edge.
Claim 10
Dependent Claim
130 words
A leak-proof alkaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with a copper layer which is adapted to be contacted with a negative electrode active material mix and said copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of said turned-up portion and the copper layer is tapered nearly to the ultimate terminal edge.
Claim 11
Dependent Claim
18 words
The cell according to claim 8, wherein the elimination of the copper layer is effected by chemical polishing.
References Cited (Backward Citations)
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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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |