US2145206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depression of carbonaceous material in flotation
Assignee: Wyeth Holdings LLC
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Filing: 1938-02-01
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Granted: 1939-01-24
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Expires: 1958-02-01
Abstract
No abstract record available.
Inventors
- 👤 Robert B Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:35
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D1/016; B03D2201/00; B03D2201/005; B03D2201/06; B03D2203/00; B03D2203/02; B03D2203/025
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) | 1942-01-23 | 1942-07-25 | 1943-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-23 | 1946-07-25 | 1947-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-23 | 1950-07-25 | 1951-01-24 | $7700.00 | Window Closed / Lapsed |