Patent US3858573A successfully refreshed from Google Patents.
US3858573A
Expired / Lapsed
US
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Alveolar gas trap and method of use
Assignee: SAID RYAN BY SAID WILLIAMS
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Filing: 1973-07-09
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Granted: 1975-01-07
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Expires: 1993-07-09
Abstract
Abstract An alveolar gas trap includes a small tubular reservoir having check valves at opposite ends and a mouthpiece so that when a person exhales through the mouthpiece, the exhalation gasses pass through the reservoir to the ambient with the last or alveolar gas being collected in the reservoir.
Inventors
- 👤 Donald F Ryan
- 👤 Allan N Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:19
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/097; G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/497
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
An alveolar gas trap for obtaining a sample of alveolar gas from a person, comprising means defining a gas reservoir having a volume equal to no greater than one hundred cubic centimeters, a mouthpiece for disposition in said person''s mouth, a first one-way check valve mounted in proximity to said mouthpiece and connected between said mouthpiece and said reservoir, said means defining a gas reservoir being mounted directly to said mouthpiece with said check valve opening directly into said reservoir so that all of the gas passing through said check valve enters said reservoir, a second one-way check valve connected between said reservoir and the ambient for passing gas from said reservoir to the ambient, said valves being self biased into a closed position with a sufficiently low force so as to be opened by the normal exhalation pressure of said person, a sampling port opening into said reservoir between said check valves, and a valve connected to said port for controlling the removal of gas from said reservoir.
Claim 2
Dependent Claim
169 words
An alveolar gas trap for obtaining a sample of alveolar gas from a person, comprising means defining a gas reservoir having a volume equal to no greater than one hundred cubic centimeters, a mouthpiece for disposition in said person''s mouth, a first one-way check valve mounted in proximity to said mouthpiece and connected between said mouthpiece and said reservoir, said means defining a gas reservoir being mounted directly to said mouthpiece with said check valve opening directly into said reservoir so that all of the gas passing through said check valve enters said reservoir, a second one-way check valve connected between said reservoir and the ambient for passing gas from said reservoir to the ambient, said valves being self biased into a closed position with a sufficiently low force so as to be opened by the normal exhalation pressure of said person, a sampling port opening into said reservoir between said check valves, and a valve connected to said port for controlling the removal of gas from said reservoir.
Claim 3
Dependent Claim
45 words
An alveolar gas trap, according to claim 1, wherein said means defining said reservoir comprises a tube, and said check valves are positioned at respectively opposite ends of said tube, whereby air flow is through said tube from one end to the other during exhalation.
Claim 4
Dependent Claim
24 words
An alveolar gas trap, according to claim 2, wherein said check valves open at a pressure differential of less than one centimeter of water.
Claim 5
Dependent Claim
21 words
An alveolar gas trap according to calim 1 wherein said reservoir has a volume no greater than about 50 cubic centimeters.
Claim 6
Dependent Claim
21 words
An alveolar gas trap according to calim 1 wherein said reservoir has a volume no greater than about 50 cubic centimeters.
Claim 7
Dependent Claim
58 words
An alveolar gas trap according to claim 1, wherein said means defining said reservoir is a straight, transparent tube, said mouthpiece is a tubular member aligned with said transparent tube and to which said transparent tube is mounted, said check valves being positioned at opposite ends of said tube, and said valve being mounted directly on said tube.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |