US2500458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary internal-combustion engine
Assignee: Individual
•
Filing: 1946-07-25
•
Granted: 1950-03-14
•
Expires: 1966-07-25
Abstract
No abstract record available.
Inventors
- 👤 John N Hinckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:18
CPC Classifications
F; F02; F02B; F02B53/00; F01; F01C; F01C1/00; F01C1/30; F01C1/40; F01C1/46; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US654721A
Cited
US920678A
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US1145161A
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US943592A
Cited
US1145627A
Cited
US1242693A
Cited
US1766005A
Cited
GB355708A
Cited
US2060937A
Cited
US2349481A
Cited
US2343948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |