US3307586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo valve
Assignee: Douglas Aircraft Co Inc
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Filing: 1964-04-01
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Granted: 1967-03-07
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Expires: 1984-04-01
Abstract
No abstract record available.
Inventors
- 👤 Meyer Robert Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:58
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A VALVE ASSEMBLY FOR CONTROLLING THE FLOW OF A HYDRAULIC FLUID COMPRISING: A VALVE BODY HAVING A LONGITUDINAL BORE THERETHROUGH, A FLUID CONDUCTING ANNUAL CHAMBER CONTAINED WITHIN SAID BORE OF SAID VALVE BODY; A VALVE SPOOL SLIDABLY CONTAINED WITHIN SAID BORE, SAID VALVE SPOOL HAVING A PLURALITY OF LONGITUDINALLY SPACED LANDS THEREON, SAID VALVE SPOOL BEING FORMED OF FIRST AND SECOND MEMBERS, SAID SECOND MEMBER BEING LONGITUDINALLY SLIDABLY MOUNTED ON A PORTION OF SAID FIRST MEMBER, EACH OF SAID FIRST AND SECOND MEMBERS HAVING ONE OF SAID LANDS THEREON, SAID LANDS COACTING TO FORM A SINGLE UNIT CAPABLE OF PREVENTING FLUID FLOW TO AND FROM SAID ANNULAR CHAMBER; A LONGITUDINAL ADJUSTMENT MEANS, SAID ADJUSTMENT MEANS BEING OPERABLE BETWEEN SAID FIRST AND SECOND MEMBERS, WHEREBY THE LONGITUDINAL DIMENSION OF SAID COACTING LANDS ARE TO BE ADJUSTABLY SPACED TO BE EQUAL TO THE LONGITUDINAL DIMENSION OF THE ANNULAR CHAMBER.
Claim 2
Dependent Claim
147 words
A VALVE ASSEMBLY FOR CONTROLLING THE FLOW OF A HYDRAULIC FLUID COMPRISING: A VALVE BODY HAVING A LONGITUDINAL BORE THERETHROUGH, A FLUID CONDUCTING ANNUAL CHAMBER CONTAINED WITHIN SAID BORE OF SAID VALVE BODY; A VALVE SPOOL SLIDABLY CONTAINED WITHIN SAID BORE, SAID VALVE SPOOL HAVING A PLURALITY OF LONGITUDINALLY SPACED LANDS THEREON, SAID VALVE SPOOL BEING FORMED OF FIRST AND SECOND MEMBERS, SAID SECOND MEMBER BEING LONGITUDINALLY SLIDABLY MOUNTED ON A PORTION OF SAID FIRST MEMBER, EACH OF SAID FIRST AND SECOND MEMBERS HAVING ONE OF SAID LANDS THEREON, SAID LANDS COACTING TO FORM A SINGLE UNIT CAPABLE OF PREVENTING FLUID FLOW TO AND FROM SAID ANNULAR CHAMBER; A LONGITUDINAL ADJUSTMENT MEANS, SAID ADJUSTMENT MEANS BEING OPERABLE BETWEEN SAID FIRST AND SECOND MEMBERS, WHEREBY THE LONGITUDINAL DIMENSION OF SAID COACTING LANDS ARE TO BE ADJUSTABLY SPACED TO BE EQUAL TO THE LONGITUDINAL DIMENSION OF THE ANNULAR CHAMBER.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |