US2500823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion engine
Assignee: Individual
•
Filing: 1945-11-10
•
Granted: 1950-03-14
•
Expires: 1965-11-10
Abstract
No abstract record available.
Inventors
- 👤 Henri J Hickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:25
CPC Classifications
F; F01; F01B; F01B7/00; F01B7/02; F01B7/04; F01B7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1005118A
Cited
US1174801A
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US1357911A
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US1463474A
Cited
GB278339A
Cited
US1827938A
Cited
US1931691A
Cited
DE602783C
Cited
US2092232A
Cited
US2305310A
Cited
US2295139A
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 |