Patent US3236339A successfully refreshed from Google Patents.
US3236339A
Expired / Lapsed
US
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Vibration dampers
Assignee: Woodhead Monroe Ltd
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Filing: 1964-07-13
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Granted: 1966-02-22
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Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 Duckett William Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:35
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/06; F16F9/062; F16F9/061; F16F9/32; F16F9/34; F16F9/348; F16F9/36; F16F9/362; F16F9/43; F16F9/432
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
IN A HYDRAULIC SHOCK ABSORBER INCLUDING A CYLINDER, A PISTON ASSEMBLY ARRANGED TO SLIDE IN SAID CYLINDER AND HAVING AT LEAST ONE PASSAGE THEREIN OFFERING RESISTANCE TO THE FLOW OF FLUID FROM ONE SIDE THEREOF TO THE OTHER, SAID CYLINDER CONSTITUTING THE WORKING CHAMBER AND HAVING ONE END CLOSED, A PISTON ROD EXTENDING THROUGH SEALING MEANS IN THE OTHER END, SAID SEALING MEANS COMPRISING A HOUSING CONTAINING A CHAMBER EXTENDING AROUND THE PISTON ROD, SAID CHAMBER HAVING AT ITS INNER AND OUTER ENDS SEALS SURROUNDING THE PISTON ROD, THE INNER SEAL PERMITTING FLOW OF FLUID INTO SAID CHAMBER FROM THE INTERIOR OF THE CYLINDER BUT PREVENTING ITS RETURN THERETO AND THE OUTER SEAL PREVENTING FLOW OF FLUID OUT OF SAID CHAMBER BUT PERMITTING FLOW INTO THE CHAMBER FROM OUTSIDE THE SHOCK ABSORBER AND A PASSAGE FOR FLUID FLOW FROM THE SAID CHAMBER BACK INTO THE WORKING CHAMBER.
Claim 2
Dependent Claim
147 words
IN A HYDRAULIC SHOCK ABSORBER INCLUDING A CYLINDER, A PISTON ASSEMBLY ARRANGED TO SLIDE IN SAID CYLINDER AND HAVING AT LEAST ONE PASSAGE THEREIN OFFERING RESISTANCE TO THE FLOW OF FLUID FROM ONE SIDE THEREOF TO THE OTHER, SAID CYLINDER CONSTITUTING THE WORKING CHAMBER AND HAVING ONE END CLOSED, A PISTON ROD EXTENDING THROUGH SEALING MEANS IN THE OTHER END, SAID SEALING MEANS COMPRISING A HOUSING CONTAINING A CHAMBER EXTENDING AROUND THE PISTON ROD, SAID CHAMBER HAVING AT ITS INNER AND OUTER ENDS SEALS SURROUNDING THE PISTON ROD, THE INNER SEAL PERMITTING FLOW OF FLUID INTO SAID CHAMBER FROM THE INTERIOR OF THE CYLINDER BUT PREVENTING ITS RETURN THERETO AND THE OUTER SEAL PREVENTING FLOW OF FLUID OUT OF SAID CHAMBER BUT PERMITTING FLOW INTO THE CHAMBER FROM OUTSIDE THE SHOCK ABSORBER AND A PASSAGE FOR FLUID FLOW FROM THE SAID CHAMBER BACK INTO THE WORKING CHAMBER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |