Patent US2476520A successfully refreshed from Google Patents.
US3115337A
Expired / Lapsed
US
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Variable spring
Assignee: Individual
•
Filing: 1961-12-13
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Granted: 1963-12-24
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Expires: 1981-12-13
Abstract
No abstract record available.
Inventors
- 👤 Daniel D Musgrave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:17
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A SPRING COMPRISING: A PLURALITY OF PAIRS OF LONGITUDINAL PORTIONS OF RESILIENT MATERIAL AND PARTIAL ELLIPTICAL PORTIONS THEREBETWEEN; SAID PARTIAL ELLIPTICAL PORTIOS HAVING MAJOR AXES IN PLANES INTERMEDIATE THE RESPECTIVE PLANES OF THE ADJACENT LONGITUDINAL PORTIONS AND MINOR AXES AT RIGHT ANGLES TO SAID MAJOR AXES; TUBULAR ELLIPTICAL MEMBERS INSERTED IN SAID PARTIAL ELLIPTICAL PORTIONS, WITH THE MAJOR AXES OF SAID MEMBERS COINCIDING WITH THE MAJOR AXES OF SAID PARTIAL ELLIPTICAL PORTIONS; AND MEANS FOR AXIAL-
Claim 2
Dependent Claim
76 words
A SPRING COMPRISING: A PLURALITY OF PAIRS OF LONGITUDINAL PORTIONS OF RESILIENT MATERIAL AND PARTIAL ELLIPTICAL PORTIONS THEREBETWEEN; SAID PARTIAL ELLIPTICAL PORTIOS HAVING MAJOR AXES IN PLANES INTERMEDIATE THE RESPECTIVE PLANES OF THE ADJACENT LONGITUDINAL PORTIONS AND MINOR AXES AT RIGHT ANGLES TO SAID MAJOR AXES; TUBULAR ELLIPTICAL MEMBERS INSERTED IN SAID PARTIAL ELLIPTICAL PORTIONS, WITH THE MAJOR AXES OF SAID MEMBERS COINCIDING WITH THE MAJOR AXES OF SAID PARTIAL ELLIPTICAL PORTIONS; AND MEANS FOR AXIAL-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-23 | 1967-06-24 | 1967-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-23 | 1971-06-24 | 1971-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-23 | 1975-06-24 | 1975-12-24 | $7700.00 | Window Closed / Lapsed |