US3915013A
Expired / Lapsed
US
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Low pressure gas sample apparatus and method
Assignee: Ethyl Corp
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Filing: 1974-02-04
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Granted: 1975-10-28
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Expires: 1994-02-04
Abstract
Abstract A method and apparatus for introducing low pressure gas samples into the column of a chromatograph without substantial flow perturbations, particularly preferred is a gas sample manifold allowing pressurization of the low pressure sample into the sample loop of a gas sample valve.
Inventors
- 👤 Gottlieb C Gaeke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:24
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/16; G01N30/20; G01N2030/207; G01N30/26; G01N30/38; G01N2030/382; G01N2030/383
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A method for introduction of a low pressure gas sample into a chromatograph column without substantial flow perturbation comprising isolating a gas sample within the sample loop of a gas sample valve, by blocking communication between said loop and the chromatograph column, pressurizing said sample in said loop of said valve to about the operating pressure of the chromatograph column with a substantially inert carrier gas and introducing the pressurized gas sample into the chromatograph column by establishing communication between said loop and said column.
Claim 2
Independent Claim
85 words
A method for introduction of a low pressure gas sample into a chromatograph column without substantial flow perturbation comprising isolating a gas sample within the sample loop of a gas sample valve, by blocking communication between said loop and the chromatograph column, pressurizing said sample in said loop of said valve to about the operating pressure of the chromatograph column with a substantially inert carrier gas and introducing the pressurized gas sample into the chromatograph column by establishing communication between said loop and said column.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the initial pressure of said low pressure gas sample is from about 0.1 to about 23 psia.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the chromatograph column operates at a pressure within the range of from about 30 to about 45 psia.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein said sample is pressurized to within about + or - 5 psi of the operating pressure of said chromatograph column.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein said sample is pressurized to within about + or - 1 psi of the operating pressure of said chromatograph column.
Claim 7
Dependent Claim
44 words
The method of claim 1 wherein the initial pressure of said low pressure gas sample is from about 0.1 to about 23 psia and said sample is pressurized to within about + or - 5 psi of the operating pressure of the chromatograph column.
Claim 8
Dependent Claim
49 words
The method of claim 1 wherein said carrier gas is nitrogen, said gas sample is pressurized to within about + or - 5 psi of said chromatograph column operating pressure and said chromatograph column operates at a pressure within the range of from about 30 to about 45 psia.
Claim 9
Independent Claim
249 words
An apparatus for introducing low pressure gas samples into a chromatograph column without substantial flow perturbation, said apparatus comprising in combination a. a gas sample valve having a plurality of ports therein, in which a first pair of said ports are connected to a carrier gas conduit for supplying carrier gas to the chromatograph column, a gas sample loop connected to a second pair of said ports, and a gas sample manifold means connected to a third pair of said ports; b. a sample conduit connected at one end to a low pressure gas sample container and at the other end to said gas sample manifold means and having therebetween a sample gas valve and a manometer; c. An auxiliary carrier gas conduit connected at one end to said gas sample manifold means and at the other end to a supply of carrier gas and having therebetween auxiliary carrier gas valve and pressure regulator valve in said auxiliary carrier gas conduit; and d. a vacuum conduit connected at one end to said gas sample manifold means and at the other end to a vacuum source and having therebetween a vacuum valve; whereby the operation of said valves in a predetermined sequence allows evacuation and purging of the apparatus, loading a low pressure gas sample into said sample loop, pressurizing said sample to about the operating pressure of the chromatograph column and introducing said sample into the chromatograph column for analysis without causing substantial flow perturbation in the chromatograph column.
Claim 10
Independent Claim
249 words
An apparatus for introducing low pressure gas samples into a chromatograph column without substantial flow perturbation, said apparatus comprising in combination a. a gas sample valve having a plurality of ports therein, in which a first pair of said ports are connected to a carrier gas conduit for supplying carrier gas to the chromatograph column, a gas sample loop connected to a second pair of said ports, and a gas sample manifold means connected to a third pair of said ports; b. a sample conduit connected at one end to a low pressure gas sample container and at the other end to said gas sample manifold means and having therebetween a sample gas valve and a manometer; c. An auxiliary carrier gas conduit connected at one end to said gas sample manifold means and at the other end to a supply of carrier gas and having therebetween auxiliary carrier gas valve and pressure regulator valve in said auxiliary carrier gas conduit; and d. a vacuum conduit connected at one end to said gas sample manifold means and at the other end to a vacuum source and having therebetween a vacuum valve; whereby the operation of said valves in a predetermined sequence allows evacuation and purging of the apparatus, loading a low pressure gas sample into said sample loop, pressurizing said sample to about the operating pressure of the chromatograph column and introducing said sample into the chromatograph column for analysis without causing substantial flow perturbation in the chromatograph column.
Claim 11
Dependent Claim
82 words
The apparatus of claim 8 wherein said gas sample valve is a six port gas sample valve having a load position in which said second pair of ports connected to said gas sample loop and said third pair of ports connected to said gas sample manifold means are in communication and an inject position in which said first pair of ports connected to said carrier gas conduit and said second pair of ports connected to said gas sample loop are in communication.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |