US3535059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary engine valve
Assignee: United States Atomic Energy Commission
•
Filing: 1968-07-02
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Granted: 1970-10-20
•
Expires: 1988-07-02
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Kalkbrenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:27
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/30; F01C1/34; F01C1/356
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US901813A
Cited
US899914A
Cited
US927781A
Cited
US1968537A
Cited
US2000984A
Cited
US2966898A
Cited
US2869516A
Cited
US3062435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |