Patent US3518975A successfully refreshed from Google Patents.
US3518975A
Expired / Lapsed
US
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Rotary-piston engine
Assignee: Individual
•
Filing: 1968-05-01
•
Granted: 1970-07-07
•
Expires: 1988-05-01
Abstract
No abstract record available.
Inventors
- 👤 Reinhold Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:20
CPC Classifications
F; F02; F02B; F02B53/00; F02B2730/00; F02B2730/05; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2485687A
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US2622787A
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US2709336A
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US2742760A
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US2808813A
Cited
US2748566A
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US3073513A
Cited
US3229674A
Cited
US3405604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |