Patent US3512907A successfully refreshed from Google Patents.
US3512907A
Expired / Lapsed
US
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Rotary combustion engine
Assignee: Wankel GmbH
•
Filing: 1968-04-25
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Granted: 1970-05-19
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Expires: 1988-04-25
Abstract
No abstract record available.
Inventors
- 👤 Adolf Belzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:47
CPC Classifications
F; F02; F02B; F02B53/00; F02B53/12; F02B1/00; F02B1/02; F02B1/04; F02B2053/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2075911A
Cited
US1813781A
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US2803228A
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US2887994A
Cited
US3058452A
Cited
US3249095A
Cited
FR1334873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |