US2459973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve internal-combustion engine
Assignee: HASLER STEVENS Corp
•
Filing: 1947-11-21
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Granted: 1949-01-25
•
Expires: 1967-11-21
Abstract
No abstract record available.
Inventors
- 👤 Harry P Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:06
CPC Classifications
F; F01; F01L; F01L7/00; F01L7/02; F01L7/021; F01L7/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR452086A
Cited
US1662908A
Cited
US1740758A
Cited
US1792991A
Cited
US1924188A
Cited
US2319733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-25 | 1952-07-26 | 1953-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-25 | 1956-07-26 | 1957-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-25 | 1960-07-26 | 1961-01-25 | $7700.00 | Window Closed / Lapsed |