Patent US4204423A successfully refreshed from Google Patents.
US4204423A
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Chromatograph
Assignee: Mobil Oil AS
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Filing: 1978-09-28
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Granted: 1980-05-27
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Expires: 1998-09-28
Abstract
Abstract An apparatus for gas and liquid chromatograph in which the chromatographic columns are heated by microwaves is provided.
Inventors
- 👤 John H. Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:24
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A chromatograph apparatus which comprises a column of a material selected from the group consisting of glass, plastic and ceramic which material does not reflect microwave radiation, said column being located within an area defined by side walls, a top wall, a bottom and a door, all of which are made of materials which reflect microwaves, microwave means for heating said column, a carrier fluid, means for establishing a flow of said carrier fluid through said column, means for introducing a sample of a material to be analyzed into said flow of carrier fluid prior to the entry of the fluid into said column and means for detecting the presence of separated components of the sample material as they are eluted from the column.
Claim 2
Dependent Claim
124 words
A chromatograph apparatus which comprises a column of a material selected from the group consisting of glass, plastic and ceramic which material does not reflect microwave radiation, said column being located within an area defined by side walls, a top wall, a bottom and a door, all of which are made of materials which reflect microwaves, microwave means for heating said column, a carrier fluid, means for establishing a flow of said carrier fluid through said column, means for introducing a sample of a material to be analyzed into said flow of carrier fluid prior to the entry of the fluid into said column and means for detecting the presence of separated components of the sample material as they are eluted from the column.
Claim 3
Dependent Claim
30 words
The chromatograph of claim 1 werein said microwave means comprises a magnetron and a wave guide for transmitting the microwave energy from the output of the magnetron to the column.
Claim 4
Dependent Claim
13 words
The chromatograph of claim 1 wherein said carrier fluid is a carrier gas.
Claim 5
Dependent Claim
12 words
The chromatograph of claim 1 wherein said carrier fluid is a solvent.
Claim 6
Dependent Claim
12 words
The chromatograph of claim 1 wherein said column is a capillary column.
Claim 7
Dependent Claim
12 words
The chromatograph of claim 1 wherein said column is a packed column.
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) | 1983-05-27 | 1983-11-26 | 1984-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-27 | 1987-11-26 | 1988-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-27 | 1991-11-26 | 1992-05-27 | $7700.00 | Window Closed / Lapsed |