US3216448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spool valve assembly
Assignee: Parker Hannifin Corp
•
Filing: 1963-02-25
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Granted: 1965-11-09
•
Expires: 1983-02-25
Abstract
No abstract record available.
Inventors
- 👤 Hugh J Stacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:59
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0716; F15; F15B; F15B13/00; F15B13/01; F15B13/015; F15B13/02; F15B13/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87056; Y10T137/87064; Y10T137/87169; Y10T137/87233; Y10T137/87241
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A VALVE ASSEMBLY COMPRISING A HOUSING HAVING A BORE INTERSECTED AXIALLY THEREALONG BY AN INLET PORT FOR CONNECTION WITH A FLUID PRESSURE SOURCE, A PAIR OF MOTOR PORTS FOR CONNECTION WITH A DOUBLE-ACTING FLUID MOTOR, AND A TANK PORT FOR CONNECTION WITH A TANK; A VALVE SPOOL RECIPROCABLE IN SAID BORE SELECTIVELY TO COMMUNICATE SAID INLET PORT WITH ONE OF SAID MOTOR PORTS, AND SAID TANK PORT WITH THE OTHER OF SAID MOTOR PORTS; A MAIN CHECK VALVE MEANS IN EACH MOTOR PORT OPENED BY FLUID PRESSURE WHEN THAT MOTOR PORT IS COMMUNICATED WITH SAID INLET PORT, A PILOT CHECK VALVE MEANS IN EACH MAIN CHECK VALVE MEANS HAVING A PORTION THEREOF EXTENDING LATERALLY INTO SAID BORE; SPRING MEANS BIASING THE RESPECTIVE PILOT CHECK VALVE MEANS AND THE ASSOCIATED MAIN CHECK VALVE MEANS TOWARD THEIR CLOSED POSITIONS; SAID SPOOL HAVING A PAIR OF CAM MEANS SELECTIVELY TO OPEN THE PILOT CHECK VALVE MEANS WHICH IS ASSOCIATED WITH THAT MOTOR PORT WHICH IS COMMUNICATED WITH SAID TANK PORT BY MOVEMENT OF SAID SPOOL AS AFORESAID; SAID MAIN AND PILOT CHECK VALVE MEANS DEFINING WITH SAID HOUS-
Claim 2
Dependent Claim
185 words
A VALVE ASSEMBLY COMPRISING A HOUSING HAVING A BORE INTERSECTED AXIALLY THEREALONG BY AN INLET PORT FOR CONNECTION WITH A FLUID PRESSURE SOURCE, A PAIR OF MOTOR PORTS FOR CONNECTION WITH A DOUBLE-ACTING FLUID MOTOR, AND A TANK PORT FOR CONNECTION WITH A TANK; A VALVE SPOOL RECIPROCABLE IN SAID BORE SELECTIVELY TO COMMUNICATE SAID INLET PORT WITH ONE OF SAID MOTOR PORTS, AND SAID TANK PORT WITH THE OTHER OF SAID MOTOR PORTS; A MAIN CHECK VALVE MEANS IN EACH MOTOR PORT OPENED BY FLUID PRESSURE WHEN THAT MOTOR PORT IS COMMUNICATED WITH SAID INLET PORT, A PILOT CHECK VALVE MEANS IN EACH MAIN CHECK VALVE MEANS HAVING A PORTION THEREOF EXTENDING LATERALLY INTO SAID BORE; SPRING MEANS BIASING THE RESPECTIVE PILOT CHECK VALVE MEANS AND THE ASSOCIATED MAIN CHECK VALVE MEANS TOWARD THEIR CLOSED POSITIONS; SAID SPOOL HAVING A PAIR OF CAM MEANS SELECTIVELY TO OPEN THE PILOT CHECK VALVE MEANS WHICH IS ASSOCIATED WITH THAT MOTOR PORT WHICH IS COMMUNICATED WITH SAID TANK PORT BY MOVEMENT OF SAID SPOOL AS AFORESAID; SAID MAIN AND PILOT CHECK VALVE MEANS DEFINING WITH SAID HOUS-
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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) | 1968-11-08 | 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 |