US4121018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive electrode for air-depolarized alkaline primary cell with thickened electrolyte
Assignee: Individual
•
Filing: 1976-08-09
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Granted: 1978-10-17
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Expires: 1996-08-09
Abstract
Abstract A positive electrode for an air-depolarized alkaline primary cell comprising a catalyst for reduction of air oxygen, which catalyst is manganese dioxide, as well as carbon and a hydroxide solution of potassium, and is characterized, according to the invention, in that said catalyst is electrolytic or synthetic manganese dioxide of γ-modification. The positive electrode of this invention can be employed in cylindrical and disc-type cells and alkaline electrolyte batteries.
Inventors
- 👤 Meer Danilovich Kocherginsky
- 👤 Lidia Fedorovna Penkova
- 👤 Viktor Arsenievich Naumenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:34
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
In an air-depolarized alkaline primary cell comprising a positive electrode and a thickened electrolyte; the improvement, whereby said cell exhibits improved storage life and service life, comprises a positive electrode formed of an air oxygen reduction catalyst, carbon, and an alkaline solution; said air oxygen reduction catalyst being manganese dioxide of γ-modification, and the mass composition of said electrode, in terms of percentage by weight, is as follows: ______________________________________
electrolytic or synthetic manganese
dioxide of γ-modification
33 to 67
carbon 12 to 40
potassium hydroxide solution
20 to 28
______________________________________
Claim 2
Dependent Claim
90 words
In an air-depolarized alkaline primary cell comprising a positive electrode and a thickened electrolyte; the improvement, whereby said cell exhibits improved storage life and service life, comprises a positive electrode formed of an air oxygen reduction catalyst, carbon, and an alkaline solution; said air oxygen reduction catalyst being manganese dioxide of γ-modification, and the mass composition of said electrode, in terms of percentage by weight, is as follows: ______________________________________
electrolytic or synthetic manganese
dioxide of γ-modification
33 to 67
carbon 12 to 40
potassium hydroxide solution
20 to 28
______________________________________
Claim 3
Dependent Claim
15 words
A positive electrode as claimed in claim 1, whose porosity is 8.5 to 40 percent.
Claim 4
Dependent Claim
61 words
A positive electrode as claimed in claim 1, including manganese ore in said mass composition, with the ratios of said electrolytic or synthetic manganese dioxide of γ-modification and said manganese ore being, respectively, in terms of percentages by weight, of from 16 to 33 and from 17 to 34, and with the weight percent of the other ingredients remaining the same.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |