US2181608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid refiner
Assignee: Collins Chemical Co Inc
•
Filing: 1935-03-04
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Granted: 1939-11-28
•
Expires: 1955-03-04
Abstract
No abstract record available.
Inventors
- 👤 John K Russell
- 👤 William B Collins
- 👤 Walter W Boggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:56
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0008
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) | 1942-11-27 | 1943-05-29 | 1943-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-27 | 1947-05-29 | 1947-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-27 | 1951-05-29 | 1951-11-28 | $7700.00 | Window Closed / Lapsed |