Patent US3672868A successfully refreshed from Google Patents.
US3672868A
Expired / Lapsed
US
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Zinc dust for removal of cobalt from electrolyte
Assignee: Nisso Kinzoku KK
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Filing: 1970-08-06
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Granted: 1972-06-27
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Expires: 1990-08-06
Abstract
Abstract ZINC DUST CONTAINING A SMALL AMOUNT OF ANTIMONY OR ANTIMONY AND LEAD AS ALLOY ELEMENTS IS ADDED INTO AN ELECTROLYTE USED IN HYDROMETALLURGY OF ZINC, IN ORDER TO REMOVE COLBALT IMPURITIES FROM THE ELCTROLYTE OF ZINC SULFATE SOLUTION.
Inventors
- 👤 Tokushige Hasegawa
- 👤 Kuninobu Makimoto
- 👤 Seiji Nihei
- 👤 Jiro Takahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:21
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/06; C25; C25C; C25C1/00; C25C1/16
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |