US3477927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrometallurgical process for treating sulphides containing non-ferrous and ferrous metal values
Assignee: Viridian Inc Canada
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Filing: 1966-09-09
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Granted: 1969-11-11
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Expires: 1986-09-09
Abstract
No abstract record available.
Inventors
- 👤 Herbert Veltman
- 👤 Patrick T O'kane
- 👤 James W Gulyas
- 👤 William R Middagh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:52
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/20; C22B19/22; C01; C01B; C01B17/00; C01B17/02; C01B17/06; C01G; C01G9/00; C01G9/06; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; 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) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |