US4269710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic apparatus
Assignee: Pye Electronic Products Ltd
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Filing: 1977-07-15
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Granted: 1981-05-26
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Expires: 1997-07-15
Abstract
Abstract Components eluted from a chromatographic column are conveyed to a detector through a conduit that is thermally conductive and in thermal contact with the detector so that negative thermal gradients are prevented when the detector is held at a temperature higher than that of the column.
Inventors
- 👤 Richard J. Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:06
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N30/62; G01N30/64; G01N30/66; G01N2030/3038; G01N2030/3084
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
Chromatographic apparatus comprising: a chromatographic separation column; means for maintaining the temperature of said column at a first predetermined temperature; a detector responsive to components eluted from said column; conduit means which function to convey components from said column to said detector; and means for heating said conduit means which function to conduct and retain heat from said detector along said conduit and prevent the formation of negative temperature gradients along said conduit means.
Claim 2
Dependent Claim
74 words
Chromatographic apparatus comprising: a chromatographic separation column; means for maintaining the temperature of said column at a first predetermined temperature; a detector responsive to components eluted from said column; conduit means which function to convey components from said column to said detector; and means for heating said conduit means which function to conduct and retain heat from said detector along said conduit and prevent the formation of negative temperature gradients along said conduit means.
Claim 3
Dependent Claim
15 words
Chromatographic apparatus as defined in claim 1, wherein said conduit means comprise a metal tube.
Claim 4
Dependent Claim
33 words
Chromatographic apparatus as defined in claim 2 and further comprising detector heating means in thermal contact with said detector which function to maintain said detector at a higher predetermined temperature than said column.
Claim 5
Dependent Claim
26 words
Chromatographic apparatus as defined in claim 3, wherein said detector heating means has a thermally conductive wall and said metal tube is in thermal contact therewith.
Claim 6
Dependent Claim
63 words
Chromatographic apparatus as defined in claim 4, wherein said means for maintaining the temperature of said column and said detector heating means are spaced from each other to define an air gap which is traversed by said metal tube and said means for heating said conduit include thermal insulation surrounding said metal tube at least over the portion thereof traversing said air gap.
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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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |