Patent US3620848A successfully refreshed from Google Patents.
US3620848A
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US
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Alkaline dry cell and permanganate cathode therefor
Assignee: Duracell Inc USA
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Filing: 1969-05-07
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Granted: 1971-11-16
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Expires: 1989-05-07
Abstract
Abstract A cathode depolarizer for alkaline dry cells comprised of active permanganate material having a high degree of insolubility in alkaline electrolytes. A process for producing the permanganate is set forth and the disclosure further describes an alkaline dry cell employing the permanganate cathode depolarizer.
Inventors
- 👤 James Epstein
- 👤 Charles C Liang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:46
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M6/00; H01M6/04; H01M6/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
33 words
The cathode depolarizer claimed in claim 1 wherein the mixture is comprised by weight of 5 percent to 25 percent conductive particulate material, and 95 percent to 75 percent permanganate active cathode material.
Claim 2
Dependent Claim
14 words
The cathode depolarizer claimed in claim 2 wherein the particulate material is micronized graphite.
Claim 3
Dependent Claim
96 words
An alkaline dry cell comprising an anode, a cathode, an alkaline electrolyte and microporous chemically inert barrier means separating said anode and said cathode, said cathode having a permanganate reaction product active cathode material said reaction product consisting of the permanganate anion of a first starting material selected from the group consisting of alkali metal permanganates and alkaline earth metal permanganates, with the quaternary ammonium cation of a second starting material selected from the group consisting of quaternary ammonium hydroxides and quaternary ammonium halides, and said cation bearing alkyl radical having at least three carbon atoms.
Claim 4
Dependent Claim
27 words
The alkaline dry cell claimed in claim 4 including further an electrolyte additive comprising a quaternary ammonium compound bearing alkyl radical having at least three carbon atoms.
Claim 5
Dependent Claim
24 words
The alkaline dry cell claimed in claim 5 wherein said electrolyte additive is selected from the group consisting of quaternary ammonium hydroxides and halides.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |