US2909284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine oil refiner
Assignee: Individual
•
Filing: 1954-11-08
•
Granted: 1959-10-20
•
Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 Kirk A Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:56
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/18; B01D35/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2553561A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |