Patent US2479930A successfully refreshed from Google Patents.
US2479930A
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US
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Recovery of precious metal values by cyanidation
Assignee: Wyeth Holdings LLC
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Filing: 1946-08-10
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Granted: 1949-08-23
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Expires: 1966-08-10
Abstract
No abstract record available.
Inventors
- 👤 Earl C Herkenhoff
- 👤 Hedley Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:11
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C01G5/00; C01G5/003; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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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) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |