Patent US3667906A successfully refreshed from Google Patents.
US3667906A
Expired / Lapsed
US
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Method for producing manganese dioxide containing less potassium
Assignee: Tekkosha Co Ltd
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Filing: 1970-05-11
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Granted: 1972-06-06
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Expires: 1990-05-11
Abstract
Abstract AN ORE CONTAINING A DECREASED AMOUNT OF POTASSIUM IS OBTAINED BY REDUCING-ROASTING MANGANESE OXIDE ORES CONTAINING POTASSIUM, THEREBY CONVERTIN MANGANESE COMPONENTS IN THE ORES INTO MNO, AND REMOVING POTASSIUM COMPONENTS FROM THE REDUCED-ROASTED ORES BY EXTRACTING THEM WITH WATER AT ELEVATED TEMPERATURES. INTO THE RESULTING ORE CONTAINING THE DECREASED AMOUNT OF POTASSIUM IS ADDED AN ACID TO EXTRACT THE MANGANESE COMPONENTS AND, FURTHERMORE, BY OXIDIZING THE MANGANESE COMPONENTS IN THE SECOND EXTRACT THUS OBTAINED ELECTROLYTICALLY OR WITH AN OXIDIZING AGENT, MANGANESE DIOXIDE CONTAINING LESS POTASSIUM CAN BE OBTAINED.
Inventors
- 👤 Seiya Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:52
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/21
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |