US3624737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-jet propulsion
Assignee: Individual
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Filing: 1969-12-15
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Granted: 1971-11-30
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Expires: 1989-12-15
Abstract
Abstract An underwater jet propulsion nozzle includes means for injecting air into the jet stream issuing from the nozzle, to give increased thrust when stationary or at low speeds. The nozzle is mounted for swiveling movement on a fixed jet pipe, and the plane of the swivel joint is inclined downwards in the direction of forward motion.
Inventors
- 👤 Ainslie E A Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/10; B63H11/107; B63H11/113
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
An underwater jet propulsion unit having an outlet water-jet nozzle, said nozzle being mounted for swiveling movement on a fixed jet pipe, the plane of the swivel joint being inclined downwards in the direction of forward motion whereby the nozzle may be swiveled for forward or reverse thrust, an annular cowl surrounding the discharge end of said nozzle and defining therewith an annular space, means to inject air into the jetstream as it issues from said nozzle comprising an air supply pipe communicating with said annular space between said cowl and said nozzle, and an air control valve for regulating the airflow through said pipe thereby to provide full thrust even at low boat speed.
Claim 2
Dependent Claim
115 words
An underwater jet propulsion unit having an outlet water-jet nozzle, said nozzle being mounted for swiveling movement on a fixed jet pipe, the plane of the swivel joint being inclined downwards in the direction of forward motion whereby the nozzle may be swiveled for forward or reverse thrust, an annular cowl surrounding the discharge end of said nozzle and defining therewith an annular space, means to inject air into the jetstream as it issues from said nozzle comprising an air supply pipe communicating with said annular space between said cowl and said nozzle, and an air control valve for regulating the airflow through said pipe thereby to provide full thrust even at low boat speed.
Claim 3
Dependent Claim
16 words
The unit of claim 1 wherein said cowl projects beyond the outlet edge of said nozzle.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |