US3605938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-flow control apparatus
Assignee: Individual
•
Filing: 1969-04-01
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Granted: 1971-09-20
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Expires: 1989-04-01
Abstract
Abstract THREE OPERATIVE POSITIONS. WHEN IT IS DISPOSED HORIZONTALLY IT CLOSES OFF THE CONCAVITY. WHEN ROTATED IN ONE DIRECTION OR ANOTHER IT ALLOWS CUSHION AIR TO ESCAPE FROM THE CONCAVITY AND ALSO SERVES TO DIRECT IT IN A PREDETERMINED DIRECTION. A FLOW CONTROL VALVE, SUITABLE FOR VENTING CUSHION AIR FROM AN AIR-CUSHION VEHICLE SO AS TO APPLY LATERAL OR LONGITUDINAL THRUST FORCES THERETO, COMPRISES A BUTTERFLYVALVE MEMBER MOUNTED FOR ROTATION WITHIN A CONCAVITY. THE HOLLOW OF THE CONCAVITY IS CONNECTED TO THE CUSHION SPACE OF THE VEHICLE. THE BUTTERFLY-VALVE MEMBER HAS
Inventors
- 👤 Paul Dominic Davis
- 👤 John Norman Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:44
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/04; B60V1/043; B60V1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |