Patent US3684491A successfully refreshed from Google Patents.
US3684491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of cobalt
Assignee: GORDON G KNAPP
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Filing: 1971-04-29
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Granted: 1972-08-15
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Expires: 1991-04-29
Abstract
Abstract A PROCESS FOR RECOVERY OF COBALT UNDER CONDITIONS FAVORING THE FORMATION OF COBALT TETRACARBONYL ANION; E.G., SPECIFICALLY THE ADDITION OF A STRONG BASE SUCH AS ALKALI METAL HYDROXIDES, CARBONATES AND OXIDES, DURING THE REDUCTIVE CARBONYLATION FOA REDUCIBLE COBALT SALT WHICH STABILIZES THE FORMATION OF THE COBALT TETRACARBONYL ANION FOR SUBSEQUENT RECOVERY OF THE COBALT VALUES.
Inventors
- 👤 Thomas H Coffield
- 👤 Gordon G Knapp
- 👤 James G Jolly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:41
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/06; C22B23/065
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |