US3175645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorber with primary and secondary damping chambers
Assignee: Stabilus Industrie und Handels GmbH
•
Filing: 1963-09-12
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Granted: 1965-03-30
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Expires: 1983-09-12
Abstract
No abstract record available.
Inventors
- 👤 Schafer Willi
- 👤 Keitel Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:02
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/48; F16F9/49
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A SHOCK ABSORBER COMPRISING A MAIN DAMPING CYLINDER ADAPTED TO CONTAIN A DAMPING FLUID; A MAIN DAMPING PISTON AND PISTON ROD OPERABLE IN SAID MAIN CYLINDER; AT LEAST ONE SECONDARY DAMPING CYLINDER AXIALLY MOUNTED WITHIN THE MAIN CYLINDER AND HAVING AN OPEN END DIRECTED TOWARD THE MAIN PISTON; A SECONDARY DAMPING PISTON ALSO SECURED TO THE SAID PISTON ROD AND OPERABLE IN THE SECONDARY DAMPING CYLINDER; AND SPRING LOADED RELIEF AND CHECK VALVES IN EACH OF SAID PISTONS TO PERMIT CONTROLLED FLOW OF DAMPING FLUID IN EACH DIRECTION THROUGH EACH OF SAID PISTONS AS THE SAID PISTONS ARE MOVED AXIALLY IN THEIR RESPECTIVE CYLINDERS, THE SECONDARY CYLINDER AND PISTON THEREBY PROVIDING AN ADDITIONAL DAMPING EFFECT SUPERIMPOSED UPON THAT OF THE MAIN CYLINDER AND PISTON.
Claim 2
Dependent Claim
124 words
A SHOCK ABSORBER COMPRISING A MAIN DAMPING CYLINDER ADAPTED TO CONTAIN A DAMPING FLUID; A MAIN DAMPING PISTON AND PISTON ROD OPERABLE IN SAID MAIN CYLINDER; AT LEAST ONE SECONDARY DAMPING CYLINDER AXIALLY MOUNTED WITHIN THE MAIN CYLINDER AND HAVING AN OPEN END DIRECTED TOWARD THE MAIN PISTON; A SECONDARY DAMPING PISTON ALSO SECURED TO THE SAID PISTON ROD AND OPERABLE IN THE SECONDARY DAMPING CYLINDER; AND SPRING LOADED RELIEF AND CHECK VALVES IN EACH OF SAID PISTONS TO PERMIT CONTROLLED FLOW OF DAMPING FLUID IN EACH DIRECTION THROUGH EACH OF SAID PISTONS AS THE SAID PISTONS ARE MOVED AXIALLY IN THEIR RESPECTIVE CYLINDERS, THE SECONDARY CYLINDER AND PISTON THEREBY PROVIDING AN ADDITIONAL DAMPING EFFECT SUPERIMPOSED UPON THAT OF THE MAIN CYLINDER AND PISTON.
References Cited (Backward Citations)
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Cited
US2606630A
Cited
US2724590A
Cited
US2743475A
Cited
US2783859A
Cited
US2924304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |