US3800734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water propulsion device
Assignee: Individual
•
Filing: 1972-06-20
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Granted: 1974-04-02
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Expires: 1992-06-20
Abstract
Abstract A compression head with an inner valve is adapted for improved water propulsion.
Inventors
- 👤 Yun Whang Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:48
CPC Classifications
A; A63; A63B; A63B31/00; A63B31/08; A63B31/10; A63B31/11; B; B63; B63B; B63B34/00; B63B34/50; B63B34/565; B63H; B63H11/00; B63H11/02; B63H11/04; B63H11/06; B63H16/00; B63H16/04; B63B34/56
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A water propulsion device comprising a hollow open shaft, said shaft having a hollow collapsible compression head portion attached to one end of said shaft, at least one opening in said hollow compression head portion, said hollow head portion comprising flexible gores between stiff ribs, valve means, said valve means disposed between said hollow compression head portion and said hollow shaft to close said opening under pressure into said hollow compression head portion and at least one opening outward of said hollow compression head portion to said valve means to open said valve means into said hollow compression head portion under pressure from outside said hollow compression head portion.
Claim 2
Dependent Claim
109 words
A water propulsion device comprising a hollow open shaft, said shaft having a hollow collapsible compression head portion attached to one end of said shaft, at least one opening in said hollow compression head portion, said hollow head portion comprising flexible gores between stiff ribs, valve means, said valve means disposed between said hollow compression head portion and said hollow shaft to close said opening under pressure into said hollow compression head portion and at least one opening outward of said hollow compression head portion to said valve means to open said valve means into said hollow compression head portion under pressure from outside said hollow compression head portion.
Claim 3
Dependent Claim
12 words
The invention of claim 1 wherein said shaft includes a hand grip.
Claim 4
Dependent Claim
13 words
The invention of claim 1 wherein said valve means are flap valve means.
Claim 5
Dependent Claim
14 words
The invention of claim 1 wherein said valve means are ball and cage means.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |