US3590939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cushion vehicle having lift fans
Assignee: Individual
•
Filing: 1968-11-25
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Granted: 1971-07-06
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Expires: 1988-11-25
Abstract
Abstract Air-cushion vehicle comprising one or more variable-pitch, axial flow, ducted lift fans, the pitch variation of which is controlled in dependence of the cushion pressure, attitude, lift power requirements or other conditions of operation of the vehicle.
Inventors
- 👤 Andre Grihangne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:40
CPC Classifications
B; B60; B60V; B60V1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
In a vehicle borne on juxtaposed nonaligned air cushions clustered in a symmetrical distribution about a substantially vertical axis and supplied simultaneously though discretely with compressed air from successive sectors of the discharge of a same ducted fan centered on said axis adjacent said cushions and having variable-pitch rotor blades, a method of controlling the attitude of said vehicle in level condition, comprising the step of cyclically varying the pitch of said rotor blades relative to each other in every revolution thereof, whereby the air supply to one of said cushions is relatively enhanced at the expense of the air supply to another of said cushions.
Claim 2
Dependent Claim
106 words
In a vehicle borne on juxtaposed nonaligned air cushions clustered in a symmetrical distribution about a substantially vertical axis and supplied simultaneously though discretely with compressed air from successive sectors of the discharge of a same ducted fan centered on said axis adjacent said cushions and having variable-pitch rotor blades, a method of controlling the attitude of said vehicle in level condition, comprising the step of cyclically varying the pitch of said rotor blades relative to each other in every revolution thereof, whereby the air supply to one of said cushions is relatively enhanced at the expense of the air supply to another of said cushions.
References Cited (Backward Citations)
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Cited
US3174573A
Cited
US3420329A
Cited
US3373836A
Cited
US3419106A
Cited
US3467213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |