Patent US3131921A successfully refreshed from Google Patents.
US3131921A
Expired / Lapsed
US
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Shock absorber
Assignee: Autoquip Corp
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Filing: 1963-03-13
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Granted: 1964-05-05
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Expires: 1983-03-13
Abstract
No abstract record available.
Inventors
- 👤 Karbowniczek Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:20
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/10; F16F9/14; F16F9/16; F16F9/18; F16F9/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
A DOUBLE ACTING SHOCK ABSORBER COMPRISING, IN COMBINATION, A STOP RING FIXED IN THE INTERIOR SURFACE OF SAID TUBE, SAID STOP RING HAVING A PAIR OF INTERIOR CONICAL SURFACES EXTENDING IN OPPOSITE DIRECTIONS, A PAIR OF ANNULAR PISTON HEADS MOVEABLY MOUNTED IN SAID TUBE, SAID TUBE INCLUDING A CLEARANE PORTION TO ALLOW A FLUID TO PASS BETWEEN THE TUBE AND THE PISTON HEADS, A RETURN SPRING CONNECTED TO EACH OF SAID PISTON HEADS AND ACTING AGAINST SAID TUBE URGING THE PISTON HEADS TOWARD THE STOP RING, EACH OF SAID PISTON HEADS HAVING AN OUTER PERIPHERAL CONICAL SURFACE ENGAGEABLE WITH THE CONICAL SURFACE OF THE STOP RING, A VENT RING FIXED TO SAID ROD AND BEING SEALINGLY ENGAGEABLE WITH THE PISTON HEADS.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |