Patent US3638397A successfully refreshed from Google Patents.
US3638397A
Expired / Lapsed
US
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Gas analysis system and method
Assignee: California Institute of Technology
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Filing: 1969-08-25
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Granted: 1972-02-01
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Expires: 1989-08-25
Abstract
Abstract A gas sample dispersed in a first carrier gas such as hydrogen is enriched by introducing into the dispersion at a controlled flow rate a mixture of a second carrier gas such as helium diluted with first carrier gas and passing the dispersion through a gas transfer device such as a heated palladium tube which is selectively permeable to the first carrier gas.
Inventors
- 👤 Kyle W Charlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:51
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/16; G01N30/06; G01N30/08; G01N30/84; G01N2030/8423
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
A method according to claim 1 in which the flow rate of helium carrier gas is maintained constant and the detector is sensitive to changes in flow rate.
Claim 2
Dependent Claim
31 words
A method according to claim 1 in which the flow rate of helium carrier gas into the effluent is less than the flow rate of hydrogen gas introduced into the effluent.
Claim 3
Dependent Claim
24 words
A method according to claim 3 in which the flow rate of helium carrier gas is less than the flow rate of the material.
Claim 4
Dependent Claim
22 words
A method according to claim 4 in which the flow rate of helium carrier gas is less than 1 ml. per minute.
Claim 5
Dependent Claim
32 words
A method according to claim 1 in which the transfer device comprises a tube of palladium heated to a temperature at which the walls of the tube are selectively permeable to hydrogen.
Claim 6
Dependent Claim
23 words
A method according to claim 6 in which the tube comprises a palladium-silver alloy heated to a temperature of 150* to 600* C.
Claim 7
Dependent Claim
22 words
A method according to claim 6 further including the step of applying an oxygen-containing atmosphere to the outside surface of the 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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |