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Patent US3674424A successfully refreshed from Google Patents.
US3674424A
Expired / Lapsed
US
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Process for purifying molybdenite concentrates
Assignee: Brenda Mines Ltd
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Filing: 1969-10-03
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Granted: 1972-07-04
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Expires: 1989-10-03
Abstract
Abstract IMPURITIES ARE REMOVED FROM MOLYBDENITE CONCENTRATES BY LEACHING THE CONCENTRATES AT A TEMPERATURE OF AT LEAST 70* C. WITH AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE ALKALI METAL OR ALKALINE EARTH METAL CHLORIDE AND AT LEAST ONE OXIDISING CHLORIDE SELECTED FROM CUPRIC AND FERRIC CHLORIDES.
Inventors
- 👤 Robert W Stanley
- 👤 Horace L Ames
- 👤 Peter H Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:22
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/34; C01; C01G; C01G39/00
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |