US3640683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing manganese dioxide for dry cell
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1969-08-06
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Granted: 1972-02-08
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Expires: 1989-08-06
Abstract
Abstract This invention relates to a method of preparing manganese dioxide with excellent battery performances, wherein naturally occuring manganese dioxide ores are employed as starting material and partially converted in air or oxygen at an elevated temperature and subsequently re-oxidized with a mixed solution of sulfuric acid and sodium or potassium chlorate.
Inventors
- 👤 Kazuhide Miyazaki
- 👤 Seiichi Tozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:35
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; C; C01; C01G; C01G45/00; C01G45/02; C01G45/024; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/10; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
A method according to claim 1, wherein said naturally occuring manganese dioxide ore is one containing more than 60 percent manganese dioxide.
Claim 2
Dependent Claim
23 words
A method according to claim 2, wherein said naturally occuring manganese dioxide ore is one containing between 60 and 80 percent manganese dioxide.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein said chlorate salt is a member selected from the group consisting of sodium chlorate and potassium chlorate.
Claim 4
Dependent Claim
28 words
A method according to claim 1, wherein the manganese suboxide inCluding in the roasted particles is oxidized with a hot aqueous solution of sodium chlorate and sulfuric acid.
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |