Patent US462318A successfully refreshed from Google Patents.
US2151007A
Expired / Lapsed
US
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Device for separating carbonaceous materials
Assignee: Individual
•
Filing: 1937-07-27
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Granted: 1939-03-21
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Expires: 1957-07-27
Abstract
No abstract record available.
Inventors
- 👤 Joel R Belknap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:35
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/62; B03B5/66
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) | 1942-03-20 | 1942-09-19 | 1943-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-03-20 | 1946-09-19 | 1947-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-03-20 | 1950-09-19 | 1951-03-21 | $7700.00 | Window Closed / Lapsed |