Patent US3761979A successfully refreshed from Google Patents.
US3761979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-inflating life raft
Assignee: Individual
•
Filing: 1971-08-23
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Granted: 1973-10-02
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Expires: 1991-08-23
Abstract
Abstract A chambered tetrahedron shaped life raft in which the walls are formed of a series of inflatable flexible tubes. The raft is provided with a weighted air scoop and filling sleeve; thus when deployed from an aircraft, the tubes are inflated by air passing through the scoop and into the filling sleeve. Upon landing in the ocean, the weighted air scoop along with the sleeve sinks below the water surface and prevents loss of air as well as carrying out the functions of an anchor. The raft which will float on one side provides a large open chamber into which people may wait for rescue.
Inventors
- 👤 R Daughenbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
B; B63; B63C; B63C9/00; B63C9/22; B63C9/23; B63C9/06; B63C9/08; B63C9/081; B63C9/065
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
An inflatable life raft for use on the ocean surface and having a chamber in which a multitude of people may wait for rescue comprising: a series of attached tubes forming the walls of said raft, said tubes sealed at one end and open at the opposite end, the tubes being generally tapering from the open end to said sealed end and defining a chamber therebetween which opens at the closed ends of the tubes; the opening to said chamber adapted to be closed by flaps of transparent material attached to the sealed ends of said tubes; said flaps sealed against the entrance of water; a manifold positioned at the open end of said tubes and intercommunicating therewith; a hollow inflation sleeve having one end opening into said manifold; an air scoop attached to the opposite end of the inflation sleeve and opening therein; thus, air entering the scoop and passing through the inflation sleeve will inflate the tubes forming the walls of said raft; the air scoop being formed of material having a negative buoyancy in water so as to provide an anchor which prevents unnecessary movement of the raft and prevents loss of air.
Claim 2
Dependent Claim
196 words
An inflatable life raft for use on the ocean surface and having a chamber in which a multitude of people may wait for rescue comprising: a series of attached tubes forming the walls of said raft, said tubes sealed at one end and open at the opposite end, the tubes being generally tapering from the open end to said sealed end and defining a chamber therebetween which opens at the closed ends of the tubes; the opening to said chamber adapted to be closed by flaps of transparent material attached to the sealed ends of said tubes; said flaps sealed against the entrance of water; a manifold positioned at the open end of said tubes and intercommunicating therewith; a hollow inflation sleeve having one end opening into said manifold; an air scoop attached to the opposite end of the inflation sleeve and opening therein; thus, air entering the scoop and passing through the inflation sleeve will inflate the tubes forming the walls of said raft; the air scoop being formed of material having a negative buoyancy in water so as to provide an anchor which prevents unnecessary movement of the raft and prevents loss of air.
Claim 3
Dependent Claim
17 words
The life raft of claim 1 wherein the air scoop is weighted to enhance its holding effect.
Claim 4
Dependent Claim
14 words
The life raft of claim 1 wherein the inflated wall tubes define a tetrahedron.
Claim 5
Dependent Claim
20 words
The life raft of claim 1 wherein the inflation sleeve has a plurality of peripheral rings to prevent collapse thereof.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |