Patent US4738308A successfully refreshed from Google Patents.
Patent US3589171A successfully refreshed from Google Patents.
US3589171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analysis system and palladium tube separator therefor
Assignee: California Institute of Technology
•
Filing: 1969-08-25
•
Granted: 1971-06-29
•
Expires: 1989-08-25
Abstract
Abstract Sequential analytical determination of a vapor sample is performed by suspending the sample in a major amount of hydrogen carrier gas or a mixed carrier gas consisting of hydrogen and helium and passing the suspension through a gas chromatograph. More than 90 percent of the hydrogen carrier gas is removed from the effluent of the chromatograph by passing the effluent through a heated palladium tube before delivering to a detector such as a mass spectrometer. Removal of the hydrogen portion of the carrier gas through the wall of the tube may be enhanced by providing an oxygen containing atmosphere at the outside surface of the tube.
Inventors
- 👤 Floyd C Haley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:07
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/72; G01N30/7206; G01N1/00; G01N1/28; G01N1/40; G01N30/84; G01N2030/8423; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
14 words
A system according to claim 1 in which the detector means is a mass-spectrometer.
Claim 2
Dependent Claim
15 words
A system accoRding to claim 1 in which said fluid is a hydrogen reactive gas.
Claim 3
Dependent Claim
13 words
A system according to claim 3 in which the reactive gas is oxygen.
Claim 4
Independent Claim
149 words
A method of analyzing a material comprising the steps of: dispersing said material in vaporous form in hydrogen as a first carrier gas; flowing said dispersion through a gas chromatographic column separator to produce an effluent containing fractionated components of the material sequentially suspended in the hydrogen carrier gas; passing said effluent through a carrier gas transfer device into contact with a first side of palladium containing film; heating said film to a temperature at which said film is totally and selectively permeable to hydrogen to transfer said hydrogen through said film to the obverse side thereof and concentrate said effluent on the first side thereof to form an effluent enriched in said components; flowing a hydrogen reactive fluid in contact with the obverse side of said film to increase the flow rate of hydrogen through said film; and detecting the presence of the components in the enriched effluent.
Claim 5
Dependent Claim
19 words
A method according to claim 5 in which said hydrogen carrier gas is totally removed in said transfer device.
Claim 6
Dependent Claim
19 words
A method according to claim 6 in which said effluent contains a second carrier gas impermeable to said film.
Claim 7
Dependent Claim
14 words
A method according to claim 7 in which said second carrier gas is helium.
Claim 8
Dependent Claim
32 words
A method according to claim 8 in which the transfer device comprises a tube comprising palladium heated to a temperature at which the walls of the tube become selectively permeable to hydrogen.
Claim 9
Dependent Claim
23 words
A method according to claim 9 in which the tube comprises a palladium-silver alloy heated to a temperature of at least 150* C.
Claim 10
Dependent Claim
15 words
A method according to claim 5 in which said fluid comprises a hydrogen reactive gas.
Claim 11
Dependent Claim
20 words
A method according to claim 11 in which said gas is oxygen which reacts with the hydrogen to form water.
Claim 12
Dependent Claim
84 words
A gas analysis system comprising in combination: column means for separating a vaporous sample into an effluent comprising sequential components of the sample dispersed in a first carrier gas; carrier gas transfer means for enriching said effluent comprising a thin walled tube selectively permeable to said first carrier gas having an inlet end for receiving said effluent tapering toward an outlet end for forming an enriched, reduced, cross section effluent; and detector means receiving said enriched effluent for sensing the components of said sample.
Claim 13
Dependent Claim
18 words
A system according to claim 13 in which said carrier gas comprises hydrogen and said tube comprises palladium.
Claim 14
Dependent Claim
28 words
A system according to claim 14 further including means for heating said tube to a temperature at which the wall of the tube is selectively permeable to hydrogen.
Claim 15
Dependent Claim
18 words
A system according to claim 13 further including means for pumping hydrogen through the wall of the tube.
Claim 16
Dependent Claim
29 words
A system according to claim 16 in which said pumping means comprise flow means for contacting the outside surface of said tube with a flow of hydrogen reactive fluid.
Claim 17
Dependent Claim
15 words
A system according to claim 17 in which the fluid is a hydrogen reactive gas.
Claim 18
Dependent Claim
13 words
A system according to claim 18 in which the reactive gas is oxygen.
References Cited (Backward Citations)
US3174326A
Cited
US3291980A
Cited
US3479798A
Cited
US3400514A
Cited
US3430417A
Cited
US3439474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |