Patent US2992536A successfully refreshed from Google Patents.
US2992536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
External combustion gas engine
Assignee: Individual
•
Filing: 1953-08-05
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Granted: 1961-07-18
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Expires: 1973-08-05
Abstract
No abstract record available.
Inventors
- 👤 Orson A Carnahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:51
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US22956A
Cited
US228716A
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US437320A
Cited
US601031A
Cited
US668626A
Cited
US1920104A
Cited
US1809409A
Cited
GB312589A
Cited
US2020923A
Cited
US2157229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |