Patent US3396709A successfully refreshed from Google Patents.
US3396709A
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Roto-piston engine
Assignee: Gulf Oil Corp
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Filing: 1966-05-09
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Granted: 1968-08-13
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Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Warren J Robicheaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:56
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/26; F01; F01B; F01B3/00; F01B3/0002; F01B3/0005; F01B3/04; F01B3/06; F01B3/08; F01B9/00; F01B9/04; F01B9/06; F02B53/00; F02B53/02; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/027; F02B2730/00; F02B2730/01; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1127267A
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US1813259A
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US2083510A
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US2269281A
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US2352396A
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US2473936A
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US2983264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |