Patent US3091447A successfully refreshed from Google Patents.
US3091447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring
Assignee: CONVO TROL Inc
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Filing: 1961-04-19
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Granted: 1963-05-28
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Expires: 1981-04-19
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Donkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:31
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A COIL SPRING, THE ADJACENT COILS THEREOF, WHEN UNWOUND, LYING ECCENTRIC TO EACH OTHER AND HAVING POINTS OF CLOSEST PROXIMITY AND CIRCUMFERENTIALLY SPACED POINTS OF MAXIMUM SPACING WITH THE POINTS OF CLOSEST PROMIMITY DISPOSED SUBSTANTIALLY ON AN INVOLUTE CURVE HAVING ITS INCEPTION AT THE INNERMOST COIL AND OPENING TOWARD THE
Claim 2
Dependent Claim
50 words
A COIL SPRING, THE ADJACENT COILS THEREOF, WHEN UNWOUND, LYING ECCENTRIC TO EACH OTHER AND HAVING POINTS OF CLOSEST PROXIMITY AND CIRCUMFERENTIALLY SPACED POINTS OF MAXIMUM SPACING WITH THE POINTS OF CLOSEST PROMIMITY DISPOSED SUBSTANTIALLY ON AN INVOLUTE CURVE HAVING ITS INCEPTION AT THE INNERMOST COIL AND OPENING TOWARD THE
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) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |