Patent US4936930A successfully refreshed from Google Patents.
Patent US1953431A successfully refreshed from Google Patents.
US1953431A
Expired / Lapsed
US
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Flotation process for nonsulphide ore
Assignee: Individual
•
Filing: 1931-09-24
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Granted: 1934-04-03
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Expires: 1951-09-24
Abstract
No abstract record available.
Inventors
- 👤 John M Patek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:25
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D1/002; B03D1/018; B03D2203/00; B03D2203/02; B03D2203/04
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) | 1937-04-02 | 1937-10-02 | 1938-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-04-02 | 1941-10-02 | 1942-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-04-02 | 1945-10-02 | 1946-04-03 | $7700.00 | Window Closed / Lapsed |