US3115156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure surge dampers particularly for braking systems
Assignee: Dunlop Rubber Co Ltd
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Filing: 1961-06-15
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Granted: 1963-12-24
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Expires: 1981-06-15
Abstract
No abstract record available.
Inventors
- 👤 Mortimer Frank Radcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:33
CPC Classifications
F; F16; F16K; F16K47/00; F16K47/08; F16K47/10; F16K17/00; F16K17/02; F16K17/04; F16K17/0433; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T137/7869
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A FLUID PRESSURE DAMPER COMPRISING A HOUSING HAVING A VALVE SEAT, AN INLET TO ONE SIDE OF SAID VALVE SEAT, AN UNRESTRICTED OUTLET FROM THE OTHER SIDE OF SAID VALVE SEAT AND A BLIND BORE EXTENDING FROM SAID OUTLET SIDE OF SAID VALVE SEAT TO A CLOSED END AND HAVING AN OPENING NEAR SAID CLOSED END THROUGH SAID HOUSING TO THE EXTERIOR THEREOF, A HOLLOW SHUTTLE SLIDABLE FLUID-TIGHTLY IN SAID BORE AND HAVING A VALVE TO SEAT ON SAID VALVE SEAT UPON MOVEMENT OF SAID SHUTTLE TOWARDS SAID CLOSED END TO CLOSE SAID OUTLET FROM SAID INLET, SAID SHUTTLE BEING OPEN TO SAID INLET AND CLOSED AT ITS OPPOSITE END AND HAVING A RESTRICTED PASSAGE FROM SAID OPEN END TO SAID OUTLET; AND A SPRING IN SAID BORE BIASING SAID SHUTTLE TO LIFT SAID VALVE FREE FROM SAID VALVE SEAT TO PROVIDE AN UNRESTRICTED PASSAGE FROM SAID INLET TO SAID OUTLET, SAID SHUTTLE BEING SLIDABLE IN SAID BORE TO CLOSE SAID VALVE ONTO SAID VALVE SEAT WHEN THE PRESSURE IN SAID INLET IS SUFFICIENT TO OVERCOME THE FORCE OF SAID SPRING.
Claim 2
Dependent Claim
181 words
A FLUID PRESSURE DAMPER COMPRISING A HOUSING HAVING A VALVE SEAT, AN INLET TO ONE SIDE OF SAID VALVE SEAT, AN UNRESTRICTED OUTLET FROM THE OTHER SIDE OF SAID VALVE SEAT AND A BLIND BORE EXTENDING FROM SAID OUTLET SIDE OF SAID VALVE SEAT TO A CLOSED END AND HAVING AN OPENING NEAR SAID CLOSED END THROUGH SAID HOUSING TO THE EXTERIOR THEREOF, A HOLLOW SHUTTLE SLIDABLE FLUID-TIGHTLY IN SAID BORE AND HAVING A VALVE TO SEAT ON SAID VALVE SEAT UPON MOVEMENT OF SAID SHUTTLE TOWARDS SAID CLOSED END TO CLOSE SAID OUTLET FROM SAID INLET, SAID SHUTTLE BEING OPEN TO SAID INLET AND CLOSED AT ITS OPPOSITE END AND HAVING A RESTRICTED PASSAGE FROM SAID OPEN END TO SAID OUTLET; AND A SPRING IN SAID BORE BIASING SAID SHUTTLE TO LIFT SAID VALVE FREE FROM SAID VALVE SEAT TO PROVIDE AN UNRESTRICTED PASSAGE FROM SAID INLET TO SAID OUTLET, SAID SHUTTLE BEING SLIDABLE IN SAID BORE TO CLOSE SAID VALVE ONTO SAID VALVE SEAT WHEN THE PRESSURE IN SAID INLET IS SUFFICIENT TO OVERCOME THE FORCE OF SAID SPRING.
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) | 1966-12-23 | 1967-06-24 | 1967-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-23 | 1971-06-24 | 1971-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-23 | 1975-06-24 | 1975-12-24 | $7700.00 | Window Closed / Lapsed |