US2690335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber spring
Assignee: Bridgestone Firestone Inc
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Filing: 1952-01-30
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Granted: 1954-09-28
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Expires: 1972-01-30
Abstract
No abstract record available.
Inventors
- 👤 James W Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:44
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/42; F16F1/50; F16F2236/00; F16F2236/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A RUBBER SPRING OF THE TYPE IN WHICH TWO RELATIVELY MOVABLE, SPACED, RIGID MEMBERS ARE SECURED TO AN INTERMEDIATE BODY OF A VULCANIZED NATURAL RUBBER COMPOSITION AND IN WHICH THE LOAD IS YIELDINGLY CARRIED BY SHEAR STRESSES IMPOSED UPON THE RUBBER BODY, SAID RUBBER COMPOSITION BEING PRIOR TO VULCANIZATION SUBSTANTIALLY AS FOLLOWS: SAID RUBBER COMPOSITION BEING ESSENTIALLY FREE OF RUBBER-INSOLUBLE PARTICULATE MATTER AND SAID RUBBER COMPOSITION BEING CHARACTERIZED BY EXHIBITING A STRESS LESS OF NO MORE THAN ABOUT 25% WHEN SUBJECTED TO 10* C. DECREMENTS EVERY 20 MINUTES FROM 70* C. TO -20* C. WHILE SAID COMPOSITION IS MAINTAINED AT A CONSTANT STRAIN OF 175% ELONGATIOR.
Claim 2
Dependent Claim
106 words
A RUBBER SPRING OF THE TYPE IN WHICH TWO RELATIVELY MOVABLE, SPACED, RIGID MEMBERS ARE SECURED TO AN INTERMEDIATE BODY OF A VULCANIZED NATURAL RUBBER COMPOSITION AND IN WHICH THE LOAD IS YIELDINGLY CARRIED BY SHEAR STRESSES IMPOSED UPON THE RUBBER BODY, SAID RUBBER COMPOSITION BEING PRIOR TO VULCANIZATION SUBSTANTIALLY AS FOLLOWS: SAID RUBBER COMPOSITION BEING ESSENTIALLY FREE OF RUBBER-INSOLUBLE PARTICULATE MATTER AND SAID RUBBER COMPOSITION BEING CHARACTERIZED BY EXHIBITING A STRESS LESS OF NO MORE THAN ABOUT 25% WHEN SUBJECTED TO 10* C. DECREMENTS EVERY 20 MINUTES FROM 70* C. TO -20* C. WHILE SAID COMPOSITION IS MAINTAINED AT A CONSTANT STRAIN OF 175% ELONGATIOR.
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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |