US2491772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extreme pressure lubricants
Assignee: Standard Oil Development Co
•
Filing: 1945-12-29
•
Granted: 1949-12-20
•
Expires: 1965-12-29
Abstract
No abstract record available.
Inventors
- 👤 Harry W Rudel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:13
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/20; C07D295/21; C10; C10M; C10M1/00; C10M1/08; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2396487A
Cited
US2438599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |