US4019372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic detector system
Assignee: EIDP Inc
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Filing: 1974-12-16
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Granted: 1977-04-26
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Expires: 1994-12-16
Abstract
Abstract The present invention is a liquid chromatograph comprising a chromatographic column; means, including a pump, connected to the input of the column for injecting a sample under pressure into the column; and a detector system, including an optically transparent flow cell and a connecting means connecting the flow cell to the output of the column. The connecting means is in thermal contact or at least thermal equilibrium with the flow cell for a sufficient length so that any liquid passing through the connecting means comes to thermal equilibrium with the flow cell before entering the optically transparent flow cell.
Inventors
- 👤 Erwin C. Parkell
- 👤 John A. Stamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:40
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/74; G01N21/00; G01N21/01; G01N21/03; G01N21/05; G01N30/84; G01N2021/0346; G01N30/26; G01N30/28; G01N30/30; G01N2030/3038
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A detector system for use with a liquid chromatographic column comprising an optically transparent flow cell and a connecting means connecting said flow cell to the output of said column, said connecting means being a long narrow tube, partially coiled around said flow cell and encapsulated by and connected to said flow cell by a thermally conductive medium, said connecting means being in thermal contact with said flow cell for a sufficient length so that any liquid passing through said connecting means come into thermal equilibrium with said flow cell before entering the optical transparent portion of said flow cell.
Claim 2
Dependent Claim
100 words
A detector system for use with a liquid chromatographic column comprising an optically transparent flow cell and a connecting means connecting said flow cell to the output of said column, said connecting means being a long narrow tube, partially coiled around said flow cell and encapsulated by and connected to said flow cell by a thermally conductive medium, said connecting means being in thermal contact with said flow cell for a sufficient length so that any liquid passing through said connecting means come into thermal equilibrium with said flow cell before entering the optical transparent portion of said flow cell.
Claim 3
Dependent Claim
18 words
The detector of claim 1 wherein said thermally conductive medium is a polymer having metallic particles dispersed therein.
Claim 4
Dependent Claim
14 words
The detector of claim 1 wherein said thermal conductive medium is a metal solder.
Claim 5
Dependent Claim
20 words
The detector of claim 1 wherein the uncoiled, encapsulated portion of said connecting means is contained within an insulating sleeve.
Claim 6
Dependent Claim
88 words
A detector system for use with a liquid chromatographic column comprising an optically transpatent flow cell and a connecting means connecting said flow cell to the output of said column, at east a portion of said connecting means comprising internal channels formed within said flow cell, said connecting means being in thermal contact with said flow cell for a sufficient length so that any liquid passing through said connecting means comes into thermal equilibrium with said flow cell before entering the optical transparent portion of said flow cell.
Claim 7
Dependent Claim
88 words
A detector system for use with a liquid chromatographic column comprising an optically transpatent flow cell and a connecting means connecting said flow cell to the output of said column, at east a portion of said connecting means comprising internal channels formed within said flow cell, said connecting means being in thermal contact with said flow cell for a sufficient length so that any liquid passing through said connecting means comes into thermal equilibrium with said flow cell before entering the optical transparent portion of said flow cell.
References Cited (Backward Citations)
US3522725A
Cited
US3941487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |