US3772886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for water jet propulsion
Assignee: Individual
•
Filing: 1970-07-01
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Granted: 1973-11-20
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Expires: 1990-07-01
Abstract
Abstract Apparatus for water jet propulsion in which a screw propeller is integrally formed with a surrounding duct, which surrounding duct rotates with the screw propeller to eliminate blade-tip vortex. A duct comprised of alternately disposed movable and stationary segments, which movable elements are adjustably positioned to mate with the stationary segments to provide optionally either an intake duct with an optimum configuration to reduce cavitation or a discharge duct with an optimum configuration.
Inventors
- 👤 D Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:54
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/10; B63H11/103; B63H23/00; B63H2023/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A duct for fluid jet propulsion apparatus comprising: a housing; a plurality of Movable segments pivotally connected to said housing; a plurality of stationary segments fixed to said housing; said movable segments and said stationary segments being alternately disposed and in adjacent relation about said housing; and means connected to said movable segments for pivoting said movable segments relative to said housing into selective mated positions with adjacent segments for at times forming a desired configuration as an intake duct and at other times forming a desired configuration as a discharge duct, said movable segments fan out pivotally from said housing into angular expansion for mating relation with said stationary segments to form a desired configuration as an intake duct.
Claim 2
Dependent Claim
120 words
A duct for fluid jet propulsion apparatus comprising: a housing; a plurality of Movable segments pivotally connected to said housing; a plurality of stationary segments fixed to said housing; said movable segments and said stationary segments being alternately disposed and in adjacent relation about said housing; and means connected to said movable segments for pivoting said movable segments relative to said housing into selective mated positions with adjacent segments for at times forming a desired configuration as an intake duct and at other times forming a desired configuration as a discharge duct, said movable segments fan out pivotally from said housing into angular expansion for mating relation with said stationary segments to form a desired configuration as an intake duct.
Claim 3
Dependent Claim
35 words
A duct as claimed in claim 1 wherein said movable segments are retracted angularly with respect to said housing for mating relation with adjacent movable segments to form a desired configuration as a discharge duct.
Claim 4
Dependent Claim
14 words
A duct as claimed in claim 2 wherein said means includes an hydraulic system.
Claim 5
Dependent Claim
21 words
A duct as claimed in claim 3 and comprising adjustment means for restricting the extent of movement of said movable segments.
References Cited (Backward Citations)
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US1326730A
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US2083447A
Cited
US2701440A
Cited
US3133412A
Cited
US3032977A
Cited
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Cited
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Cited
US3531214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |