US2667405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of a manganese dioxide for use as depolarizer in dry cells
Assignee: Bayer AG
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Filing: 1951-01-09
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Granted: 1954-01-26
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Expires: 1971-01-09
Abstract
No abstract record available.
Inventors
- 👤 Muller Wilhelm
- 👤 Kircher Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:11
CPC Classifications
C; C01; C01G; C01G45/00; C01G45/02; C01G45/024; H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
PROCESS FOR PRODUCTION OF A-MANGANESE DIOXIDE WHICH COMPRISES HEATING A MANGANESE DIOXIDE SELECTED FROM THE GROUP CONSISTING OF AMORPHOUS AND Y-MANGANESE DIOXIDE WITH A MINERAL ACID OF ABOUT 50-100% STRENGTH TO A TEMPERATURE OF ABOUT 70-120% STRENGTH TO A OF TIME OF ABOUT 1/2 TO 1 HOUR, INTERRUPTING THE HEAT TREATMENT, REMOVING THE ACID FROM THE AMANGANESE DIOXIDE FORMED, WASHING THE A-MANGANESE DIOXIDE UNTIL FREE FROM ACID AND DRYING.
Claim 2
Dependent Claim
69 words
PROCESS FOR PRODUCTION OF A-MANGANESE DIOXIDE WHICH COMPRISES HEATING A MANGANESE DIOXIDE SELECTED FROM THE GROUP CONSISTING OF AMORPHOUS AND Y-MANGANESE DIOXIDE WITH A MINERAL ACID OF ABOUT 50-100% STRENGTH TO A TEMPERATURE OF ABOUT 70-120% STRENGTH TO A OF TIME OF ABOUT 1/2 TO 1 HOUR, INTERRUPTING THE HEAT TREATMENT, REMOVING THE ACID FROM THE AMANGANESE DIOXIDE FORMED, WASHING THE A-MANGANESE DIOXIDE UNTIL FREE FROM ACID AND DRYING.
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |