Patent US2421543A successfully refreshed from Google Patents.
US2421543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant
Assignee: Union Oil Company of California
•
Filing: 1945-01-19
•
Granted: 1947-06-03
•
Expires: 1965-01-19
Abstract
No abstract record available.
Inventors
- 👤 James F Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
C; C10; C10M; C10M125/00; C10M125/22; C10M125/24; C10M2201/00; C10M2201/06; C10M2201/062; C10M2201/065; C10M2201/066; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/913
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US576307A
Cited
US1957259A
Cited
US2156803A
Cited
US2258309A
Cited
US2195669A
Cited
US2290032A
Cited
US2283581A
Cited
US2285739A
Cited
US2367946A
Cited
US2361211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |