US3441372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction process for separation of zinc from cadmium
Assignee: Imperial Smelting Corp Ltd
•
Filing: 1966-01-24
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Granted: 1969-04-29
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Expires: 1986-01-24
Abstract
No abstract record available.
Inventors
- 👤 John Lionel Pegler
- 👤 David Peter Pepworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:12
CPC Classifications
C; C22; C22B; C22B17/00; C22B17/04; C01; C01G; C01G11/00; C01G9/00; C01G9/003; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/384; C22B3/3846; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2992894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |