US2730089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve internal combustion engine
Assignee: Individual
•
Filing: 1952-06-04
•
Granted: 1956-01-10
•
Expires: 1972-06-04
Abstract
No abstract record available.
Inventors
- 👤 Louis O French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:52
CPC Classifications
F; F01; F01L; F01L7/00; F01L7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1389536A
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US1649486A
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GB307574A
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US2181868A
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US2331801A
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US2305874A
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US2374191A
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US2377336A
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US2381711A
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US2415155A
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GB601217A
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US2394767A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |