Patent US3887345A successfully refreshed from Google Patents.
US3887345A
Expired / Lapsed
US
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Gas chromatograph injection system
Assignee: National Aeronautics and Space Administration
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Filing: 1974-02-27
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Granted: 1975-06-03
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Expires: 1994-02-27
Abstract
Abstract An injection system for a gas chromatograph is provided wherein the sample to be introduced is placed in a chamber which may be cool and not under pressure and is then injected into the apparatus by changing the position of a valve and heating the chamber whereby the sample is volatilized and swept by a carrier gas into the analysis apparatus.
Inventors
- 👤 Glenn E Pollock
- 👤 Milton E Henderson
- 👤 Jr Ralph W Donaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:19
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/06; G01N30/12; G01N1/00; G01N1/02; G01N1/22; G01N1/2226; G01N2001/2229; G01N2030/126
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
An injection system for a gas chromatographic column comprising in combination: a. an injection chamber for receiving a sample to be analyzed; b. valve means for controlling the flow of carrier gas; c. said chamber having three conduits leading into said chamber, a first conduit for inserting a sample into said chamber and for venting gas and solvent, a second conduit connected through a restrictor to said valve means and to said chamber for injecting carrier gas into said chamber, and a third conduit connected to said valve means and said chromatographic column for injecting gas into said chamber and for sweeping a vaporized sample into said chromatographic column; d. means for closing said 1st conduit; and e. flash heating means for heating said chamber and for vaporizing said sample.
Claim 2
Dependent Claim
130 words
An injection system for a gas chromatographic column comprising in combination: a. an injection chamber for receiving a sample to be analyzed; b. valve means for controlling the flow of carrier gas; c. said chamber having three conduits leading into said chamber, a first conduit for inserting a sample into said chamber and for venting gas and solvent, a second conduit connected through a restrictor to said valve means and to said chamber for injecting carrier gas into said chamber, and a third conduit connected to said valve means and said chromatographic column for injecting gas into said chamber and for sweeping a vaporized sample into said chromatographic column; d. means for closing said 1st conduit; and e. flash heating means for heating said chamber and for vaporizing said sample.
Claim 3
Dependent Claim
130 words
An injection system for a gas chromatographic column comprising in combination: a. an injection chamber for receiving a sample to be analyzed; b. valve means for controlling the flow of carrier gas; c. said chamber having three conduits leading into said chamber, a first conduit for inserting a sample into said chamber and for venting gas and solvent, a second conduit connected through a restrictor to said valve means and to said chamber for injecting carrier gas into said chamber, and a third conduit connected to said valve means and said chromatographic column for injecting gas into said chamber and for sweeping a vaporized sample into said chromatographic column; d. means for closing said 1st conduit; and e. flash heating means for heating said chamber and for vaporizing said sample.
Claim 4
Dependent Claim
130 words
An injection system for a gas chromatographic column comprising in combination: a. an injection chamber for receiving a sample to be analyzed; b. valve means for controlling the flow of carrier gas; c. said chamber having three conduits leading into said chamber, a first conduit for inserting a sample into said chamber and for venting gas and solvent, a second conduit connected through a restrictor to said valve means and to said chamber for injecting carrier gas into said chamber, and a third conduit connected to said valve means and said chromatographic column for injecting gas into said chamber and for sweeping a vaporized sample into said chromatographic column; d. means for closing said 1st conduit; and e. flash heating means for heating said chamber and for vaporizing said sample.
Claim 5
Dependent Claim
46 words
The structure of claim 1 including a baffle extending downwardly into said injection chamber and separating said first and second conduits from said third conduit for preventing direct flow of gas and vapor between said first and second conduits and said third conduit and vice versa.
Claim 6
Dependent Claim
24 words
The structure of claim 1 wherein said injection chamber is in the form of a hemisphere having a rounded bottom and a flat top.
Claim 7
Dependent Claim
20 words
The structure of claim 1 wherein said injection chamber is in the form of a cylinder having a conical bottom.
Claim 8
Dependent Claim
151 words
An injection system for a gas chromatographic column comprising in combination: a. an injection chamber for receiving a sample to be analyzed; b. valve means controlling the flow of carrier gas to said chamber; c. said chamber having four conduits leading into said chamber, a first conduit for inserting a sample into said chamber and for venting gas and solvent, a second conduit connected to said valve means and said chamber for injecting carrier gas into said chamber, a third conduit connected through a restrictor to said valve means and to said chamber for injecting carrier gas into said chamber and for sweeping a vaporized sample into said column, and a fourth conduit connected to said chamber and said column for carrying vaporized sample and gas into said chromatographic column; d. means for closing said first conduit; and e. flash heating means for heating said chamber and for vaporizing said sample.
Claim 9
Dependent Claim
151 words
An injection system for a gas chromatographic column comprising in combination: a. an injection chamber for receiving a sample to be analyzed; b. valve means controlling the flow of carrier gas to said chamber; c. said chamber having four conduits leading into said chamber, a first conduit for inserting a sample into said chamber and for venting gas and solvent, a second conduit connected to said valve means and said chamber for injecting carrier gas into said chamber, a third conduit connected through a restrictor to said valve means and to said chamber for injecting carrier gas into said chamber and for sweeping a vaporized sample into said column, and a fourth conduit connected to said chamber and said column for carrying vaporized sample and gas into said chromatographic column; d. means for closing said first conduit; and e. flash heating means for heating said chamber and for vaporizing said sample.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |