US3282168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic servo control systems
Assignee: Lockheed Martin Corp
•
Filing: 1963-09-05
•
Granted: 1966-11-01
•
Expires: 1983-09-05
Abstract
No abstract record available.
Inventors
- 👤 Paul F Hayner
- 👤 Bernier Gerald Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:20
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/08; B63H25/14; B63H25/26; B63H25/28; F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0438; F15B9/00; F15B9/16; F15B9/17; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/8659; Y10T137/86598
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A HYDRAULIC SERVO SYSTEM HAVING A HYDRAULIC PISTON LOAD, MEANS INCLUDING A PLURALITY OF LIQUID CONDUITS FOR SUPPLYING LIQUID TO OPPOSITE SIDES OF SAID PISTON FOR ACUTATION THEREOF, AND A HYDRAULIC SERVO VALVE FOR CONTROLLING FLOW OF LIQUID TO SAID PISTON LOAD, SAID VALVE FORMING A PISTON MOVABLE IN A CHAMBER TO OPEN AND CLOSE PORTS PROPORTIONATELY, SAID VALVE PISTON HAVING CIRCUMFERENTIALLY REDUCED PORTIONS DEFINED BY A SMOOTH, CONTINUOUS LONGITUDINAL CURVE SO THAT SAID PISTON IS GRADUALLY TAPERED TO AND FROM THE MINIMUM SECTIONAL DIMENSION OF SAID REDUCED PORTIONS, AND VALVE PISTON PRESENTING A CONVEX SURFACE TO SAID PORTS TO EFFECT LAMINAR FLOW OF LIQUID PASSING THERETHROUGH SAID CIRCUMFERENTIALLY REDUCED PORTIONS HAVING A PLURALITY OF RADIALLY EXTENDING VANES DISPOSED THEREIN.
Claim 2
Dependent Claim
121 words
IN A HYDRAULIC SERVO SYSTEM HAVING A HYDRAULIC PISTON LOAD, MEANS INCLUDING A PLURALITY OF LIQUID CONDUITS FOR SUPPLYING LIQUID TO OPPOSITE SIDES OF SAID PISTON FOR ACUTATION THEREOF, AND A HYDRAULIC SERVO VALVE FOR CONTROLLING FLOW OF LIQUID TO SAID PISTON LOAD, SAID VALVE FORMING A PISTON MOVABLE IN A CHAMBER TO OPEN AND CLOSE PORTS PROPORTIONATELY, SAID VALVE PISTON HAVING CIRCUMFERENTIALLY REDUCED PORTIONS DEFINED BY A SMOOTH, CONTINUOUS LONGITUDINAL CURVE SO THAT SAID PISTON IS GRADUALLY TAPERED TO AND FROM THE MINIMUM SECTIONAL DIMENSION OF SAID REDUCED PORTIONS, AND VALVE PISTON PRESENTING A CONVEX SURFACE TO SAID PORTS TO EFFECT LAMINAR FLOW OF LIQUID PASSING THERETHROUGH SAID CIRCUMFERENTIALLY REDUCED PORTIONS HAVING A PLURALITY OF RADIALLY EXTENDING VANES DISPOSED THEREIN.
References Cited (Backward Citations)
US2146827A
Cited
US2242656A
Cited
US2709366A
Cited
US2886009A
Cited
US2934938A
Cited
US2969773A
Cited
US2971536A
Cited
US2939430A
Cited
US3071061A
Cited
US3198212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |