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US3457722A
Expired / Lapsed
US
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Hot gas engines method and apparatus
Assignee: Individual
•
Filing: 1966-04-05
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Granted: 1969-07-29
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Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Vannevar Bush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:46
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G2244/00; F02G2244/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2508315A
Cited
US2583311A
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US2643508A
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US2492788A
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US2602645A
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US2701129A
Cited
US3216190A
Cited
US3145527A
Cited
US3275102A
Cited
US3315465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |