Patent US3218938A successfully refreshed from Google Patents.
US3218938A
Expired / Lapsed
US
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Control fault veto
Assignee: Allard Way Holdings Ltd
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Filing: 1964-08-10
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Granted: 1965-11-23
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Expires: 1984-08-10
Abstract
No abstract record available.
Inventors
- 👤 Geoffrey S Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:53
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5196
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A HYDRAULIC ACTUATOR COMPRISING A DOUBLE-ACTING PISTON AND CYLINDER, A CONTROL VALVE FOR CONTROLLING THE ADMISSION AND RELEASE OF HYDRAULIC FLUID TO AND FROM THE TWO ENDS OF SAID CYLINDER TO CONTROL THE MOVEMENT OF SAID PISTON THEREIN, AND A VETO VALVE FOR CONTROLLING THE FLOW OF HYDRAULIC FLUID THROUGH SAID CONTROL VALVE TO EXERCISE AN OVERRIDING CONTROL, SAID VETO VALVE HAVING A NEUTRAL POSITION IN WHICH SAID PISTON IS ALLOWED TO OPERATE NORMALLY UNDER THE CONTROL OF SAID CONTROL VALVE, A FIRST OPERATIVE POSITION IN WHICH SAID PISTON IS ALLOWED TO MOVE NORMALY UNDER THE CONTROL OF SAID CONTROL VALVE IN ONE DIRECTION BUT IS PREVENTED FROM BEING ACTUATED IN THE
Claim 2
Dependent Claim
112 words
A HYDRAULIC ACTUATOR COMPRISING A DOUBLE-ACTING PISTON AND CYLINDER, A CONTROL VALVE FOR CONTROLLING THE ADMISSION AND RELEASE OF HYDRAULIC FLUID TO AND FROM THE TWO ENDS OF SAID CYLINDER TO CONTROL THE MOVEMENT OF SAID PISTON THEREIN, AND A VETO VALVE FOR CONTROLLING THE FLOW OF HYDRAULIC FLUID THROUGH SAID CONTROL VALVE TO EXERCISE AN OVERRIDING CONTROL, SAID VETO VALVE HAVING A NEUTRAL POSITION IN WHICH SAID PISTON IS ALLOWED TO OPERATE NORMALLY UNDER THE CONTROL OF SAID CONTROL VALVE, A FIRST OPERATIVE POSITION IN WHICH SAID PISTON IS ALLOWED TO MOVE NORMALY UNDER THE CONTROL OF SAID CONTROL VALVE IN ONE DIRECTION BUT IS PREVENTED FROM BEING ACTUATED IN THE
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |