US2633860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequential and differential valve actuation
Assignee: Lockheed Martin Corp
•
Filing: 1947-04-04
•
Granted: 1953-04-07
•
Expires: 1967-04-04
Abstract
No abstract record available.
Inventors
- 👤 Edward R Derrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:25
CPC Classifications
F; F02; F02C; F02C7/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US640767A
Cited
US757692A
Cited
US929852A
Cited
US1525859A
Cited
US1591671A
Cited
US1861742A
Cited
US1905065A
Cited
US1980478A
Cited
US2038998A
Cited
GB471540A
Cited
US2559814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |