Patent US3570481A successfully refreshed from Google Patents.
US3570481A
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Cryogenic underwater breathing apparatus
Assignee: Cryogenic Systems Inc
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Filing: 1968-10-23
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Granted: 1971-03-16
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Expires: 1988-10-23
Abstract
Abstract Cryogenic underwater breathing apparatus includes a liquid state air storing vessel with outlet ports on antipodal, diametrically opposite ends thereof. Liquid air flows through a selected one of the tank output ports under gravity actuation depending upon the attitude of the tank, with the air being converted to a gaseous state in a heat exchanger and thence flowing to a reservoir and an output demand regulator for consumption. Regulator control valves are provided to maintain the end air product stored in the reservoir at a predetermined pressure above that of the ambient environmental medium.
Inventors
- 👤 James W Woodberry Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:43
CPC Classifications
F; F17; F17C; F17C7/00; F17C7/02; F17C7/04; B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2201/05; F17C2201/058; F17C2203/00; F17C2203/01; F17C2203/011; F17C2203/013; F17C2203/03; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2225/00; F17C2225/01; F17C2225/0107; F17C2225/0123; F17C2250/00; F17C2250/06; F17C2250/0605; F17C2250/0636; F17C2270/00; F17C2270/07; F17C2270/0781; Y; Y10; Y10S; Y10S128/00; Y10S128/27
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
An underwater breathing apparatus comprising vessel means for storing air in liquified form, two output ports disposed at antipodal locations on said vessel means, an air output reservoir, first heat exchanging means connecting one of said vessel output ports with said reservoir, second heat exchanging means connecting the other of said output ports with said reservoir, and demand regulator means connected to said reservoir for extracting air from said reservoir as end use requires.
Claim 2
Dependent Claim
74 words
An underwater breathing apparatus comprising vessel means for storing air in liquified form, two output ports disposed at antipodal locations on said vessel means, an air output reservoir, first heat exchanging means connecting one of said vessel output ports with said reservoir, second heat exchanging means connecting the other of said output ports with said reservoir, and demand regulator means connected to said reservoir for extracting air from said reservoir as end use requires.
Claim 3
Dependent Claim
39 words
A combination as in claim 1 further comprising valve means connected between said reservoir and each of said vessel output ports for isolating said reservoir from said vessel means when the pressure in said reservoir exceeds a threshold level.
Claim 4
Dependent Claim
44 words
A combination as in claim 2 wherein said valve means comprises pressure regulating control valve means including valve actuating means responsive to the pressure in said reservoir, the ambient pressure and a valve internal biasing force for selectively changing the state of said valve.
Claim 5
Dependent Claim
80 words
A combination as in claim 2 wherein said valve means comprises regulating control valves including a first chamber open to said vessel means, a second chamber open to said reservoir, a valve seating orifice between said chambers, plate means exposed on one side to the air pressure within said reservoir and exposed on the other side to the ambient pressure, means for mechanically biasing said plate means, valve seat-sealing means, and means connecting said plate means and said seat-sealing means.
Claim 6
Dependent Claim
43 words
A combination as in claim 2 wherein said vessel means comprises an inner vessel for storing liquified air, and outer jacket, spacer means for holding said vessel in a spaced relation within said jacket, and insulation disposed between said vessel and said jacket.
Claim 7
Dependent Claim
18 words
A combination as in claim 2 further comprising manifold means connected to each of said vessel output ports.
Claim 8
Dependent Claim
31 words
A combination as in claim 6 further comprising at least one additional liquified air storing vessel means connected to said manifold means, each of said vessel means being connected in parallel.
Claim 9
Dependent Claim
19 words
A combination as in claim 2 further comprising vent, fill, and pressure relief valves connected to said vessel means.
Claim 10
Dependent Claim
185 words
In combination in an underwater breathing apparatus, vessel means for storing air in liquified form, output ports disposed at opposite ends of said vessel means, at least one of said ports being surrounded in the area within said vessel means by liquid state air independent of the orientation of said vessel means under control of the force of gravIty acting on the liquified air mass, common output air supplying means, first and second connecting means each including heat exchanging means arranged in a parallel relationship for respectively connecting said vessel output ports with said air supplying means, valve means included in said first and second connecting means for selectively permitting the flow of liquid state air to pass to one of said heat exchanging means and thence to said common output air supplying means, said valve means including means for selectively isolating said vessel means responsive to the pressure within said output air supplying means exceeding a threshold level with respect to the ambient pressure, said first and second connecting means being further connected together to define a conduit path between said vessel output ports.
Claim 11
Dependent Claim
185 words
In combination in an underwater breathing apparatus, vessel means for storing air in liquified form, output ports disposed at opposite ends of said vessel means, at least one of said ports being surrounded in the area within said vessel means by liquid state air independent of the orientation of said vessel means under control of the force of gravIty acting on the liquified air mass, common output air supplying means, first and second connecting means each including heat exchanging means arranged in a parallel relationship for respectively connecting said vessel output ports with said air supplying means, valve means included in said first and second connecting means for selectively permitting the flow of liquid state air to pass to one of said heat exchanging means and thence to said common output air supplying means, said valve means including means for selectively isolating said vessel means responsive to the pressure within said output air supplying means exceeding a threshold level with respect to the ambient pressure, said first and second connecting means being further connected together to define a conduit path between said vessel output ports.
Claim 12
Dependent Claim
26 words
A combination as in claim 9 wherein said heat exchanging means includes means for vaporizing and warming the liquified air supplied via said vessel output ports.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |