Patent US3331383A successfully refreshed from Google Patents.
US3331383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-hydraulic servo valves
Assignee: Individual
•
Filing: 1966-04-29
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Granted: 1967-07-18
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Expires: 1986-04-29
Abstract
No abstract record available.
Inventors
- 👤 J D Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:37
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; Y10T137/86582; Y10T137/86606; Y10T137/86614
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
AN ELECTRO-HYDRAULIC SERVO VALVE INCLUDING THE COMBINATION OF A PILOT VALVE AND A POWER SPOOL, THE PILOT VALVE HAVING A POLARIZED RELAY HAVING A WINDING AND A SWINGER WITH AN EXTENSION HAVING AN EJECTOR JET, THE POWER SPOOL CONTROLLING CYLINDER AND EXHAUST PORTS, THE POWER SPOOL HAVING OPPOSED PRESSURE CHAMBERS SUPPLIED WITH FLUID UNDER PRESSURE FROM RECEPTOR JETS ASSOCIATED WITH THE EJECTOR JET, THE IMPROVEMENT WHEREIN SAID RECEPTOR JETS ARE SUPPORTED BY A CYLINDRICAL MEMBER ROTARY ABOUT A LONGITUDINAL AXIS, WALL MEANS PROVIDING A BEARING SUPPORT FOR SAID CYLINDRICAL MEMBER, A CASING HAVING A CAVITY, SAID WALL MEANS DIVIDING SAID CAVITY INTO TWO CHAMBERS, ONE END OF SAID CYLINDRICAL MEMBER WITH SAID RECEPTOR JETS EXTENDING INTO ONE OF SAID CHAMBERS, THE OTHER END OF SAID CYLINDRICAL MEMBER EXTENDING INTO THE OTHER CHAMBER, WHERE A FEEDBACK ARM ON SAID CYLINDRICAL MEMBER IS PROVIDED FOR SAID POWER SPOOL, AND SAID FEEDBACK ARM BEING CONTROLLED BY SAID POWER SPOOL FOR CAUSING SAID RECEPTOR JETS TO FOLLOW SAID EJECTOR JET.
Claim 2
Dependent Claim
166 words
AN ELECTRO-HYDRAULIC SERVO VALVE INCLUDING THE COMBINATION OF A PILOT VALVE AND A POWER SPOOL, THE PILOT VALVE HAVING A POLARIZED RELAY HAVING A WINDING AND A SWINGER WITH AN EXTENSION HAVING AN EJECTOR JET, THE POWER SPOOL CONTROLLING CYLINDER AND EXHAUST PORTS, THE POWER SPOOL HAVING OPPOSED PRESSURE CHAMBERS SUPPLIED WITH FLUID UNDER PRESSURE FROM RECEPTOR JETS ASSOCIATED WITH THE EJECTOR JET, THE IMPROVEMENT WHEREIN SAID RECEPTOR JETS ARE SUPPORTED BY A CYLINDRICAL MEMBER ROTARY ABOUT A LONGITUDINAL AXIS, WALL MEANS PROVIDING A BEARING SUPPORT FOR SAID CYLINDRICAL MEMBER, A CASING HAVING A CAVITY, SAID WALL MEANS DIVIDING SAID CAVITY INTO TWO CHAMBERS, ONE END OF SAID CYLINDRICAL MEMBER WITH SAID RECEPTOR JETS EXTENDING INTO ONE OF SAID CHAMBERS, THE OTHER END OF SAID CYLINDRICAL MEMBER EXTENDING INTO THE OTHER CHAMBER, WHERE A FEEDBACK ARM ON SAID CYLINDRICAL MEMBER IS PROVIDED FOR SAID POWER SPOOL, AND SAID FEEDBACK ARM BEING CONTROLLED BY SAID POWER SPOOL FOR CAUSING SAID RECEPTOR JETS TO FOLLOW SAID EJECTOR JET.
References Cited (Backward Citations)
US2724397A
Cited
US2742022A
Cited
US3017864A
Cited
US3137309A
Cited
US3205782A
Cited
US3233623A
Cited
US3211182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |