Patent US3913967A successfully refreshed from Google Patents.
Patent US3114361A successfully refreshed from Google Patents.
US3114361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring tension device
Assignee: Individual
•
Filing: 1961-10-24
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Granted: 1963-12-17
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Expires: 1981-10-24
Abstract
No abstract record available.
Inventors
- 👤 Wilbur L Mullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:55
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN AN INTERNAL COMBUSTION ENGINE HAVING A VALVE STEM, A VALVE KEEPER, A VALVE CAP AND A VALVE SPRING, A SPRING TENSION DEVICE DISPOSED AROUND SAID VALVE STEM AND BETWEEN SAID VALVE SPRING AND SAID VALVE CAP COMPRISING A FIRST AND A SECOND CURVED MEMBER EACH HAVING END PORTIONS, AND LOCKING MEANS DISPOSED ON SAID END
Claim 2
Dependent Claim
56 words
IN AN INTERNAL COMBUSTION ENGINE HAVING A VALVE STEM, A VALVE KEEPER, A VALVE CAP AND A VALVE SPRING, A SPRING TENSION DEVICE DISPOSED AROUND SAID VALVE STEM AND BETWEEN SAID VALVE SPRING AND SAID VALVE CAP COMPRISING A FIRST AND A SECOND CURVED MEMBER EACH HAVING END PORTIONS, AND LOCKING MEANS DISPOSED ON SAID END
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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) | 1966-12-16 | 1967-06-17 | 1967-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-16 | 1971-06-17 | 1971-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-16 | 1975-06-17 | 1975-12-17 | $7700.00 | Window Closed / Lapsed |