Patent US529761A successfully refreshed from Google Patents.
Patent US3081787A successfully refreshed from Google Patents.
US3081787A
Expired / Lapsed
US
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Hydraulic control valve
Assignee: Pneumo Dynamics Corp
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Filing: 1961-07-13
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Granted: 1963-03-19
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Expires: 1981-07-13
Abstract
No abstract record available.
Inventors
- 👤 John W Meulendyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:35
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0436; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2322; Y10T137/2409; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A VALVE COMPRISING A SPOOL HAVING A NULL POSITION, A SOURCE OF FLUID UNDER PRESSURE, MEANS IN SAID SPOOL FOR RECEIVING FLUID UNDER PRESSURE FROM SAID SOURCE, FLOW DIRECTING MEANS FOR RECEIVING FLUID UNDER PRESSURE FROM SAID MEANS IN SAID SPOOL, A FIRST RECEIVER AND A SECOND RECEIVER FOR SAID FLUID, SAID FLOW DIRECTING MEANS INCLUDING A DISCHARGE FOR DIRECTING FLUID UNDER PRESSURE INTO SAID FIRST AND SECOND RECEIVERS IN EQUAL FLOW QUANTITIES, MEANS FOR APPLYING THE FLUID UNDER PRESSURE FROM SAID FIRST AND SECOND RECEIVERS TO OPPOSITELY DISPOSED PORTIONS OF THE SPOOL TO MAINTAIN THE SPOOL IN NULL POSITION, MEANS FOR DISPLACING SAID FLOW DIRECTING MEANS FOR DIRECTING FLUID UNDER PRESSURE INTO SAID FIRST AND SECOND RECEIVERS IN UNEQUAL FLOW QUANTITIES TO DISPLACE THE SPOOL FROM ITS NULL POSITION TO A SECOND POSITION IN WHICH EQUAL FLOW QUANTITIES OF FLUID UNDER PRESSURE ARE DELIVERED TO SAID FIRST AND SECOND RECEIVERS FROM THE DISPLACED FLOW DIRECTING MEANS TO MAINTAIN THE SPOOL IN SAID SECOND POSITION.
Claim 2
Dependent Claim
165 words
A VALVE COMPRISING A SPOOL HAVING A NULL POSITION, A SOURCE OF FLUID UNDER PRESSURE, MEANS IN SAID SPOOL FOR RECEIVING FLUID UNDER PRESSURE FROM SAID SOURCE, FLOW DIRECTING MEANS FOR RECEIVING FLUID UNDER PRESSURE FROM SAID MEANS IN SAID SPOOL, A FIRST RECEIVER AND A SECOND RECEIVER FOR SAID FLUID, SAID FLOW DIRECTING MEANS INCLUDING A DISCHARGE FOR DIRECTING FLUID UNDER PRESSURE INTO SAID FIRST AND SECOND RECEIVERS IN EQUAL FLOW QUANTITIES, MEANS FOR APPLYING THE FLUID UNDER PRESSURE FROM SAID FIRST AND SECOND RECEIVERS TO OPPOSITELY DISPOSED PORTIONS OF THE SPOOL TO MAINTAIN THE SPOOL IN NULL POSITION, MEANS FOR DISPLACING SAID FLOW DIRECTING MEANS FOR DIRECTING FLUID UNDER PRESSURE INTO SAID FIRST AND SECOND RECEIVERS IN UNEQUAL FLOW QUANTITIES TO DISPLACE THE SPOOL FROM ITS NULL POSITION TO A SECOND POSITION IN WHICH EQUAL FLOW QUANTITIES OF FLUID UNDER PRESSURE ARE DELIVERED TO SAID FIRST AND SECOND RECEIVERS FROM THE DISPLACED FLOW DIRECTING MEANS TO MAINTAIN THE SPOOL IN SAID SECOND POSITION.
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) | 1966-03-18 | 1966-09-17 | 1967-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-18 | 1970-09-17 | 1971-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-18 | 1974-09-17 | 1975-03-19 | $7700.00 | Window Closed / Lapsed |