US3171640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cushion and return device for dies
Assignee: Riley Power Inc
•
Filing: 1961-12-15
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Granted: 1965-03-02
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Expires: 1981-12-15
Abstract
No abstract record available.
Inventors
- 👤 James V Perrone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:53
CPC Classifications
B; B21; B21D; B21D24/00; B21D24/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7772; Y10T137/7777
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A FLUID FLOW CONTROL VALVE, A VALVE BODY HAVING FIRST AND SECOND COAXIAL BORES SEPARATED BY AN ANNULAR RADIAL WALL, A HOLLOW PISTON SLIDABLE IN SAID FIRST BORE, A VALVE SEAT ON SAID ANNULAR WALL SEALINGLY ENGAGEABLE BY SAID PISTON, A PORT IN SAID PISTON PROVIDING FLOW BETWEEN SAID FIRST BORE AND SAID SEAT, A SECOND PISTON IN SAID SECOND BORE HAVING A PISTON ROD EXTENDING INTO ENGAGEMENT WITH SAID HOLLOW PISTON TO MOVE SAID HOLLOW PISTON AWAY FROM SAID PORT, AND FLUID MEANS FOR MOVING SAID SECOND PISTON IN A DIRECTION TO FORCE SAID HOLLOW PISTON AWAY FROM SAID PORT.
Claim 2
Dependent Claim
102 words
IN A FLUID FLOW CONTROL VALVE, A VALVE BODY HAVING FIRST AND SECOND COAXIAL BORES SEPARATED BY AN ANNULAR RADIAL WALL, A HOLLOW PISTON SLIDABLE IN SAID FIRST BORE, A VALVE SEAT ON SAID ANNULAR WALL SEALINGLY ENGAGEABLE BY SAID PISTON, A PORT IN SAID PISTON PROVIDING FLOW BETWEEN SAID FIRST BORE AND SAID SEAT, A SECOND PISTON IN SAID SECOND BORE HAVING A PISTON ROD EXTENDING INTO ENGAGEMENT WITH SAID HOLLOW PISTON TO MOVE SAID HOLLOW PISTON AWAY FROM SAID PORT, AND FLUID MEANS FOR MOVING SAID SECOND PISTON IN A DIRECTION TO FORCE SAID HOLLOW PISTON AWAY FROM SAID PORT.
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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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |