Patent EP0328126A2 successfully refreshed from Google Patents.
Patent US2852007A successfully refreshed from Google Patents.
US2852007A
Expired / Lapsed
US
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Rotary piston engine
Assignee: Individual
•
Filing: 1957-10-28
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Granted: 1958-09-16
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Expires: 1977-10-28
Abstract
No abstract record available.
Inventors
- 👤 Bancroft Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:31
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/02; F01C1/063; F02; F02B; F02B53/00; F02B53/02; Y; Y10; Y10S; Y10S60/00; Y10S60/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |