Patent US3539280A successfully refreshed from Google Patents.
US3539280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endothermic rotary engine with shiftable blades
Assignee: Individual
•
Filing: 1968-02-07
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Granted: 1970-11-10
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Expires: 1988-02-07
Abstract
No abstract record available.
Inventors
- 👤 Alfredo Ravera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:21
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/30; F01C1/34; F01C1/356; F01C1/3566; F01C1/344; F01C1/3446; F02; F02B; F02B53/00; F02B2730/00; F02B2730/01; F02B2730/012; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US167489A
Cited
US1440451A
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US1839275A
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US2015027A
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US2214833A
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US2366213A
Cited
US2507151A
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US2583633A
Cited
US2771860A
Cited
US3286698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |