US2471387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine protective device
Assignee: HEISKELL WEATHERFORD JR
•
Filing: 1946-09-14
•
Granted: 1949-05-24
•
Expires: 1966-09-14
Abstract
No abstract record available.
Inventors
- 👤 James H Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/18; F01M1/20; F01M1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2373735A
Cited
US2356679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |