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US1943758A
Expired / Lapsed
US
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Process of concentrating ores and minerals by flotation
Assignee: EIDP Inc
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Filing: 1925-02-25
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Granted: 1934-01-16
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Expires: 1945-02-25
Abstract
No abstract record available.
Inventors
- 👤 William A Douglass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:06
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/008; B03D2201/00; B03D2201/04; B03D2203/00; B03D2203/02
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) | 1937-01-15 | 1937-07-17 | 1938-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-15 | 1941-07-17 | 1942-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-15 | 1945-07-17 | 1946-01-16 | $7700.00 | Window Closed / Lapsed |