US2291849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterflow centrifuge and method of treating one liquid with another liquid of different specific gravity
Assignee: ARTHUR M HOOD
•
Filing: 1934-04-18
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Granted: 1942-08-04
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Expires: 1954-04-18
Abstract
No abstract record available.
Inventors
- 👤 Fay M Tomlinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:54
CPC Classifications
B; B04; B04B; B04B3/00; B04B5/00; B04B5/06; C; C10; C10G; C10G21/00; Y; Y10; Y10S; Y10S494/00; Y10S494/901
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) | 1945-08-03 | 1946-02-02 | 1946-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-08-03 | 1950-02-02 | 1950-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-08-03 | 1954-02-02 | 1954-08-04 | $7700.00 | Window Closed / Lapsed |