US3403983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam distillation of metal values in solution
Assignee: Mallinckrodt Chemical Works
•
Filing: 1965-01-11
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Granted: 1968-10-01
•
Expires: 1985-01-11
Abstract
No abstract record available.
Inventors
- 👤 Charles O Gerfen
- 👤 John R Ruhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:45
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C01; C01G; C01G33/00; C01G35/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3051547A
Cited
US2962372A
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US3117833A
Cited
US3164537A
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US3112991A
Cited
US3186833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |