US3363891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound curved spring motor
Assignee: EDWIN E FOSTER
•
Filing: 1966-04-11
•
Granted: 1968-01-16
•
Expires: 1986-04-11
Abstract
No abstract record available.
Inventors
- 👤 Edwin E Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:28
CPC Classifications
F; F03; F03G; F03G1/00; F03G1/02; F03G1/022; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A SPRING COMPRISING A RIBBON HAVING A LONGITUDINALLY STRESSED FORCE URGING SAID SPRING INTO A COIL OF WOUND CONVOLUTIONS WHEN IN REPOSE, SAID LONGITUDINAL STRESS TENDING TO CAUSE A NATURAL CONCAVE-CONVEX CROSS-SECTION IN SAID SPRING WHEN EXTENDED FROM ITS WOUND CONDITION, SAID SPRING FURTHER HAVING A FORMED CROSS-CURVATURE WHICH IS IN THE SAME DIRECTION AS, AND SUPPLEMENTARY OF, SAID NATURAL CONCAVE-CONVEX CROSS-SECTION, AND SAID SPRING ALSO HAVING EDGE PORTIONS STRETCHED BEYOND THEIR ELASTIC LIMIT FOR CAUSING THE CONCAVE SIDE OF SAID SPRING CROSS-CURVATURE TO ASSUME OPPOSED RELATIONSHIP, WITH RESPECT TO THE CENTER OF SAID COIL WHEN THE SPRING IS IN EXTENDED CONDITION AND IN COILED CONDITION.
Claim 2
Dependent Claim
106 words
A SPRING COMPRISING A RIBBON HAVING A LONGITUDINALLY STRESSED FORCE URGING SAID SPRING INTO A COIL OF WOUND CONVOLUTIONS WHEN IN REPOSE, SAID LONGITUDINAL STRESS TENDING TO CAUSE A NATURAL CONCAVE-CONVEX CROSS-SECTION IN SAID SPRING WHEN EXTENDED FROM ITS WOUND CONDITION, SAID SPRING FURTHER HAVING A FORMED CROSS-CURVATURE WHICH IS IN THE SAME DIRECTION AS, AND SUPPLEMENTARY OF, SAID NATURAL CONCAVE-CONVEX CROSS-SECTION, AND SAID SPRING ALSO HAVING EDGE PORTIONS STRETCHED BEYOND THEIR ELASTIC LIMIT FOR CAUSING THE CONCAVE SIDE OF SAID SPRING CROSS-CURVATURE TO ASSUME OPPOSED RELATIONSHIP, WITH RESPECT TO THE CENTER OF SAID COIL WHEN THE SPRING IS IN EXTENDED CONDITION AND IN COILED CONDITION.
References Cited (Backward Citations)
US2833534A
Cited
US2956795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |