US2873574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination hot air and internal combustion engine
Assignee: CLARA M LONG
•
Filing: 1956-05-16
•
Granted: 1959-02-17
•
Expires: 1976-05-16
Abstract
No abstract record available.
Inventors
- 👤 Leon C Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:07
CPC Classifications
F; F02; F02G; F02G3/00; F02G3/02; F02G1/00; F02G1/04; F02G1/043; F02G1/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1079578A
Cited
US1305581A
Cited
US1063386A
Cited
US1212917A
Cited
US1473486A
Cited
US1645170A
Cited
GB244032A
Cited
US2769435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |