US3701599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast acting valve
Assignee: SECO DYN Inc
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Filing: 1970-11-25
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Granted: 1972-10-31
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Expires: 1990-11-25
Abstract
Abstract A FAST ACTING SPOOL TYPE VALVE HAVING AN INLET PORT, A NORMALLY OPEN OUTLET PORT, AND A NORMALLY CLOSED OUTLET PORT. LOW PRESSURE IS APPLIED TO CONTINUOUSLY URGE THE SPOOL ASSEMBLY TO A FORWARD POSITION IN COMMUNICATION WITH A HIGH PRESSURE CHAMBER TO AN EXTENT INSUFFICIENT TO OVERCOME THE LOW PRESSURE FORCE. A SOLENOID VALVE, AIDED BY AN ELECTROMECHANICAL BOOSTER, SHIFTS THE SPOOL TO APPLY THE HIGH PRESSURE AGAINST A PORTION OF THE SPOOL SUFFICIENT TO OVERCOME THE FORWARD PRESSURE AND ACCELERATE THE SPOOL TO ITS REAR POSITION. A CONSTANT-VOLUME DAMPENING CHAMBER EFFECTS SMOOTH DECELERATION OF THE SPOOL ASSEMBLY. D R A W I N G
Inventors
- 👤 William K Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:37
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K31/00; F16K31/12; F16K31/42; F16K31/423; F16K31/426; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |