US3216446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spool valve assembly with dual check valve assembly
Assignee: Parker Hannifin Corp
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Filing: 1963-02-05
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Granted: 1965-11-09
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Expires: 1983-02-05
Abstract
No abstract record available.
Inventors
- 👤 Herbert H Schmiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:55
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F15; F15B; F15B13/00; F15B13/02; Y; Y10; Y10S; Y10S280/00; Y10S280/10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7845; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671; Y10T137/87169; Y10T137/87917; Y10T137/88054
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
192 words
A VALVE ASSEMBLY HAVING A FEED PASSAGE FOR CONNECTION WITH A FLUID PRESSURE SOURCE, A MOTOR PASSAGE FOR CONNECTION WITH A FLUID MOTOR, AND A RETURN PASSAGE FOR CONNECTION WITH A FLUID RESERVOIR, AND A VALVE MEMBER MOVABLE ALTERNATELY TO COMMUNICATE SAID MOTOR PASSAGE WITH SAID FEED PASSAGE AND SAID RETURN PASSAGE; SAID ASSEMBLY HAVING A COAXIAL FIRST AND SECOND CHECK VALVE MEANS TELESCOPED ONE WITHIN THE OTHER, AND A SPRING COMPRESSED BETWEEN SAID CHECK VALVE MEANS BIASING THEM AGAINST COAXIAL SEATS IN SAID FEED PASSAGE AND IN A PORTION OF SAID RETURN PASSAGE LEADING TO SAID MOTOR PASSAGE, SAID FIRST CHECK VALVE MEANS BEING OPERATIVE TO MOVE AWAY FROM ITS SEAT BY FLUID PRESSURE IN SAID FEED PASSAGE EXCEEDING THAT IN SAID MOTOR PASSAGE TO PERMIT FLUID TO FLOW FROM SAID FEED PASSAGE TO SAID MOTOR PASSAGE WHEN SAID FEED AND MOTOR PASSAGES ARE IN FLUID COMMUNICATION THROUGH SAID VALVE MEMBER, AND SAID SECOND CHECK VALVE MEANS BEING OPERATIVE TO MOVE AWAY FROM ITS SEAT BY FLUID PRESSURE IN SAID RETURN PASSAGE EXCEEDING THAT IN SAID MOTOR PASSAGE TO PERMIT FLUID TO FLOW FROM SAID RETURN PASSAGE TO SAID MOTOR PASSAGE.
Claim 2
Dependent Claim
192 words
A VALVE ASSEMBLY HAVING A FEED PASSAGE FOR CONNECTION WITH A FLUID PRESSURE SOURCE, A MOTOR PASSAGE FOR CONNECTION WITH A FLUID MOTOR, AND A RETURN PASSAGE FOR CONNECTION WITH A FLUID RESERVOIR, AND A VALVE MEMBER MOVABLE ALTERNATELY TO COMMUNICATE SAID MOTOR PASSAGE WITH SAID FEED PASSAGE AND SAID RETURN PASSAGE; SAID ASSEMBLY HAVING A COAXIAL FIRST AND SECOND CHECK VALVE MEANS TELESCOPED ONE WITHIN THE OTHER, AND A SPRING COMPRESSED BETWEEN SAID CHECK VALVE MEANS BIASING THEM AGAINST COAXIAL SEATS IN SAID FEED PASSAGE AND IN A PORTION OF SAID RETURN PASSAGE LEADING TO SAID MOTOR PASSAGE, SAID FIRST CHECK VALVE MEANS BEING OPERATIVE TO MOVE AWAY FROM ITS SEAT BY FLUID PRESSURE IN SAID FEED PASSAGE EXCEEDING THAT IN SAID MOTOR PASSAGE TO PERMIT FLUID TO FLOW FROM SAID FEED PASSAGE TO SAID MOTOR PASSAGE WHEN SAID FEED AND MOTOR PASSAGES ARE IN FLUID COMMUNICATION THROUGH SAID VALVE MEMBER, AND SAID SECOND CHECK VALVE MEANS BEING OPERATIVE TO MOVE AWAY FROM ITS SEAT BY FLUID PRESSURE IN SAID RETURN PASSAGE EXCEEDING THAT IN SAID MOTOR PASSAGE TO PERMIT FLUID TO FLOW FROM SAID RETURN PASSAGE TO SAID MOTOR PASSAGE.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |