Patent US5049312A successfully refreshed from Google Patents.
US5288310A
Expired / Lapsed
US
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Adsorbent trap for gas chromatography
Assignee: University of Michigan (System)
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Filing: 1992-09-30
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Granted: 1994-02-22
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Expires: 2012-09-30
Abstract
Abstract A gas chromatography system in which prefocusing of a sample analyte is provided through the use of an adsorbent coated porous layer open tubular trap tube. Through the use of an adsorbent coated collection device low boiling point components can be successfully trapped for preconcentration and injection at temperatures well above that necessary when employing conventional cryo-focusing.
Inventors
- 👤 Anita J. Peters
- 👤 Richard D. Sacks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:10
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/06; G01N30/12; G01N30/26; G01N30/38; G01N30/40; G01N2030/022; G01N2030/025; G01N2030/121; G01N2030/122; G01N2030/123; G01N2030/126; G01N2030/128; G01N30/28; G01N30/30; G01N2030/3046; G01N2030/382; G01N2030/383; G01N30/62; G01N2030/621; G01N2030/623
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
167 words
A gas chromatography system for the separation of components of a sample mixture, comprising: a trap in the form of a porous layer open tubular column having an adsorbent coating on the inside surface of said tube, temperature control means for causing said trap to be selectively held at a trapping temperature above the freezing point of a number of said components or a higher desorption temperature; fluid circuit means for causing the sample mixture to be introduced into said trap while said trap is at said trapping temperature causing at least some of the components of the sample mixture to be adsorbed onto said adsorbent coating and for causing said adsorbed components to be desorbed from said trap when said trap is at said desorption temperature, said desorbed components of the sample mixture being at least partially eluted, and a detector for receiving said desorbed component of the sample mixture and providing an output related to the concentrations of said desorbed components of the sample mixture.
Claim 2
Dependent Claim
167 words
A gas chromatography system for the separation of components of a sample mixture, comprising: a trap in the form of a porous layer open tubular column having an adsorbent coating on the inside surface of said tube, temperature control means for causing said trap to be selectively held at a trapping temperature above the freezing point of a number of said components or a higher desorption temperature; fluid circuit means for causing the sample mixture to be introduced into said trap while said trap is at said trapping temperature causing at least some of the components of the sample mixture to be adsorbed onto said adsorbent coating and for causing said adsorbed components to be desorbed from said trap when said trap is at said desorption temperature, said desorbed components of the sample mixture being at least partially eluted, and a detector for receiving said desorbed component of the sample mixture and providing an output related to the concentrations of said desorbed components of the sample mixture.
Claim 3
Dependent Claim
27 words
A gas chromatography system according to claim 1 further comprising an analytical column connected to said trap for separation of the desorbed components of the sample mixture.
Claim 4
Dependent Claim
17 words
A gas chromatography system according to claim 2 wherein said analytical column has an adsorbent stationary phase.
Claim 5
Dependent Claim
22 words
A gas chromatography system according to claim 1 wherein the sample mixture includes hydrocarbons in the C 1 to C 10 range.
Claim 6
Dependent Claim
34 words
A gas chromatography system according to claim 1 wherein said temperature control means provides said trapping temperature by exposing said trap to a cold gas and said desorption temperature by a resistive heating element.
Claim 7
Dependent Claim
32 words
A gas chromatography system according to claim 1 wherein the sample mixture includes methane gas and the methane gas becomes adsorbed onto said trap when said trap is at said trapping temperature.
Claim 8
Dependent Claim
28 words
A gas chromatography system according to claim 1 wherein said trap is a porous layer open tubular column having said adsorbent coating of Al 2 O 3 .
Claim 9
Dependent Claim
25 words
A gas chromatography system according to claim 1 wherein said trap is a porous layer open tubular column having said adsorbent coating of Styrene-Divinylbenzene material.
Claim 10
Dependent Claim
45 words
A gas chromatography system according to claim 1 wherein said fluid circuit means causes the sample mixture to be trapped as a carrier gas flows through said trap in one direction and said flow continues in said one direction as said adsorbed components are desorbed.
Claim 11
Dependent Claim
49 words
A gas chromatography system according to claim 1 wherein said fluid circuit means causes the sample mixture to be trapped as a carrier gas flows through said trap in one direction as the components are adsorbed and said flow occurs in an opposite direction as said components are desorbed.
Claim 12
Dependent Claim
21 words
A gas chromatography system according to claim 1 wherein said trap tubular column has an inside diameter less than 1 mm.
Claim 13
Dependent Claim
20 words
A gas chromatography system according to claim 1 wherein said trap tubular column has a length less than 50 cm.
Claim 14
Dependent Claim
24 words
A gas chromatography system according to claim 1 wherein desorption of said adsorbed sample components occurs within an interval of less than 100 ms.
Claim 15
Dependent Claim
43 words
A gas chromatography system according to claim 1 wherein individual components of the sample mixture are desorbed from said trap tube at distinct time intervals and thus the components of the sample mixture are at least partially separated by said trap tubular column.
Claim 16
Dependent Claim
214 words
A gas chromatography system for the separation of components of a sample mixture, comprising: a trap in the form of a porous layer open tubular column having an adsorbent coating on the inside surface of said tube and said tube having an internal diameter less than 1 mm and a length of less than 50 cm, temperature control means for causing said trap to be selectively held at a trapping temperature above the freezing point of a number of said components or a higher desorption temperature, fluid circuit means for causing the sample mixture to be introduced into said trap while said trap is at said trapping temperature causing at least some of the components of the sample mixture to be adsorbed onto said adsorbent coating and for causing the adsorbed components to be desorbed from said trap when said trap is at said desorption temperature, said desorbed components of the sample mixture being at least partially eluted, said trap and said temperature control means causing the desorption of any of said adsorbed components of the sample mixture to be complete in less than 100 ms, and a detector for receiving said desorbed component of the sample mixture and providing an output related to the concentrations of said desorbed components of the sample mixture.
Claim 17
Dependent Claim
214 words
A gas chromatography system for the separation of components of a sample mixture, comprising: a trap in the form of a porous layer open tubular column having an adsorbent coating on the inside surface of said tube and said tube having an internal diameter less than 1 mm and a length of less than 50 cm, temperature control means for causing said trap to be selectively held at a trapping temperature above the freezing point of a number of said components or a higher desorption temperature, fluid circuit means for causing the sample mixture to be introduced into said trap while said trap is at said trapping temperature causing at least some of the components of the sample mixture to be adsorbed onto said adsorbent coating and for causing the adsorbed components to be desorbed from said trap when said trap is at said desorption temperature, said desorbed components of the sample mixture being at least partially eluted, said trap and said temperature control means causing the desorption of any of said adsorbed components of the sample mixture to be complete in less than 100 ms, and a detector for receiving said desorbed component of the sample mixture and providing an output related to the concentrations of said desorbed components of the sample mixture.
Claim 18
Dependent Claim
26 words
A gas chromatography system according to claim 15 further comprising an analytical column connected to said trap for separation of the components desorbed from said trap.
Claim 19
Dependent Claim
17 words
A gas chromatography system according to claim 16 wherein said analytical column has an adsorbent stationary phase.
Claim 20
Dependent Claim
22 words
A gas chromatography system according to claim 15 wherein the sample mixture includes hydrocarbons in the C 1 to C 10 range.
Claim 21
Dependent Claim
34 words
A gas chromatography system according to claim 15 wherein said temperature control means provides said trapping temperature by exposing said trap to a cold gas and said desorption temperature by a resistive heating element.
Claim 22
Dependent Claim
32 words
A gas chromatography system according to claim 15 wherein the sample mixture includes methane gas and the methane gas becomes adsorbed onto said trap when said trap is at said trapping temperature.
Claim 23
Dependent Claim
18 words
A gas chromatography system according to claim 15 wherein said adsorbent coating of Al 2 O 3 .
Claim 24
Dependent Claim
15 words
A gas chromatography system according to claim 15 wherein said adsorbent coating of Styrene-Divinylbenzene material.
Claim 25
Dependent Claim
45 words
A gas chromatography system according to claim 15 wherein said fluid circuit means causes the sample mixture to be trapped as a carrier gas flows through said trap in one direction and said flow continues in said one direction as said adsorbed components are desorbed.
Claim 26
Dependent Claim
49 words
A gas chromatography system according to claim 15 wherein said fluid circuit means causes the sample mixture to be trapped as a carrier gas flows through said trap in one direction as the components are adsorbed and said flow occurs in an opposite direction as said components are desorbed.
Claim 27
Dependent Claim
27 words
A gas chromatography system according to claim 24 wherein said desorption of any of said adsorbed sample component occurs within an interval of less than 100 ms.
Claim 28
Dependent Claim
42 words
A gas chromatography system according to claim 15 wherein individual components of the sample mixture are desorbed from said trap tube at distinct time intervals and thus the components of the sample mixture are at least partially separated by said trap tube.
Claim 29
Dependent Claim
219 words
A gas chromatography system for the separation of components of a sample mixture, comprising: a trap in the form of a porous layer open tubular column having an adsorbent coating on the inside surface of said tube, an analytical separation column connected to said trap, temperature control means for causing said trap to be selectively held at a trapping temperature above the freezing point of a number of said components or a higher desorption temperature, fluid circuit means for causing the sample mixture to be introduced into said trap while said trap is at said trapping temperature causing at least some of the components of the sample mixture to be adsorbed onto said adsorbent coating and for causing said adsorbed components to be desorbed from said trap when said trap is at said desorption temperature, said desorbed components of the sample mixture being at least partially eluted, and said fluid circuit means for causing said sample mixture to be introduced into said trap in a flow direction into an end of said trap connected to said analytical separation column, and in an opposite flow direction out of said end as said components are desorbed, and a detector for receiving said component after said desorption and providing an output related to the concentrations of said components in the sample mixture.
Claim 30
Dependent Claim
219 words
A gas chromatography system for the separation of components of a sample mixture, comprising: a trap in the form of a porous layer open tubular column having an adsorbent coating on the inside surface of said tube, an analytical separation column connected to said trap, temperature control means for causing said trap to be selectively held at a trapping temperature above the freezing point of a number of said components or a higher desorption temperature, fluid circuit means for causing the sample mixture to be introduced into said trap while said trap is at said trapping temperature causing at least some of the components of the sample mixture to be adsorbed onto said adsorbent coating and for causing said adsorbed components to be desorbed from said trap when said trap is at said desorption temperature, said desorbed components of the sample mixture being at least partially eluted, and said fluid circuit means for causing said sample mixture to be introduced into said trap in a flow direction into an end of said trap connected to said analytical separation column, and in an opposite flow direction out of said end as said components are desorbed, and a detector for receiving said component after said desorption and providing an output related to the concentrations of said components in the sample mixture.
Claim 31
Dependent Claim
18 words
A gas chromatography system according to claim 27 wherein said analytical column has an adsorbent stationary phase coating.
Claim 32
Dependent Claim
22 words
A gas chromatography system according to claim 27 wherein the sample mixture includes hydrocarbons in the C 1 to C 10 range.
Claim 33
Dependent Claim
33 words
A gas chromatography system according to claim 27 wherein said temperature control means provides said trapping temperature by exposing said trap to cold gas and said desorption temperature by a resistive heating element.
Claim 34
Dependent Claim
32 words
A gas chromatography system according to claim 27 wherein the sample mixture includes methane gas and the methane gas comes adsorbed onto said trap when said trap is at said trapping temperature.
Claim 35
Dependent Claim
18 words
A gas chromatography system according to claim 27 wherein said adsorbent coating of Al 2 O 3 .
Claim 36
Dependent Claim
14 words
Agas chromatography system according to claim 27 wherein said adsorbent coating of Styrene-Divinylbenzene material.
Claim 37
Dependent Claim
21 words
A gas chromatography system according to claim 27 wherein said trap tubular column has an inside diameter less than 1 mm.
Claim 38
Dependent Claim
20 words
A gas chromatography system according to claim 27 wherein said trap tubular column has a length less than 50 cm.
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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) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |