Patent US4125638A successfully refreshed from Google Patents.
US4125638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry cells with stainless steel current collector
Assignee: Panasonic Holdings Corp
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Filing: 1976-12-10
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Granted: 1978-11-14
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Expires: 1996-12-10
Abstract
Abstract Disclosed is a dry cell comprising a depolarizing mix consisting of manganese dioxide, carbon black and an electrolytic solution containing, as a major electrolyte, a neutral salt, a zinc anode and a cathode collector made of an alloy containing iron as a major component and more than 10% by weight of chromium.
Inventors
- 👤 Jun Watanabe
- 👤 Akira Ohta
- 👤 Shigeo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:17
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/669; H01M4/661; H01M6/00; H01M6/04; H01M6/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A dry cell comprising (a) a depolarizing mix consisting essentially of manganese dioxide, carbon black and zinc perchlorate as an electrolyte, (b) an anode made of zinc, and (c) a cathode collector made of an alloy containing iron as a major component and more than 10% by weight of chromium.
Claim 2
Dependent Claim
50 words
A dry cell comprising (a) a depolarizing mix consisting essentially of manganese dioxide, carbon black and zinc perchlorate as an electrolyte, (b) an anode made of zinc, and (c) a cathode collector made of an alloy containing iron as a major component and more than 10% by weight of chromium.
Claim 3
Dependent Claim
46 words
A dry cell as set forth in claim 1 wherein the electrolyte is zinc perchlorate, and said cathode collector is made of an alloy containing iron as a major component and more than 10% by weight of chromium and 0.5 to 3% by weight of molybdenum.
Claim 4
Dependent Claim
46 words
A dry cell as set forth in claim 1 wherein said cathode collector is made of an alloy containing iron as a major component, more than 10% by weight of chromium, 2 to 15% by weight of nickel and 0.5 to 3% by weight of molybdenum.
Claim 5
Dependent Claim
36 words
A dry cell as set forth in claim 1 wherein said cathode collector is made of an alloy containing iron as a major component, about 30% by weight of chromium and 2% by weight of molybdenum.
Claim 6
Dependent Claim
39 words
A dry cell as set forth in claim 1 wherein said cathode collector is made of an alloy containing iron as a major component, more than 16% by weight of chromium and more than 3% by weight of nickel.
Claim 7
Dependent Claim
38 words
A dry cell as set forth in claim 2 wherein said cathode collector is made of an alloy containing iron as a major component and about 20% by weight of chromium and about 2% by weight of molybdenum.
Claim 8
Dependent Claim
43 words
A dry cell as set forth in claim 3 wherein said cathode collector is made of an alloy containing iron as a major component, about 16% by weight of chromium, about 12% by weight of nickel and about 3% by weight of molybdenum.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |