US4598765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sample cell temperature stabilizer
Assignee: PerkinElmer Instruments LLC
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Filing: 1984-02-03
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Granted: 1986-07-08
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Expires: 2004-02-03
Abstract
Abstract An apparatus for modifying the temperature of the effluent of a fluid stream entering a flow cell which includes a counterflow heat exchange between the outlet fluid and the inlet fluid and a thermally equilibrating the flow cell with the inlet fluid after it has passed through the counterflow heat exchange and before it enters the flow cell.
Inventors
- 👤 John Atwood
- 👤 Charles Helms
- 👤 Raymond P. W. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/0332; G01N21/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
In a liquid chromatograph a thermal equilibrating apparatus for equilibrating the temperature of liquid as it passes through a flow cell comprising, in combination: a flow cell housing having an inlet port and an outlet port through which liquid can pass from said inlet port to said outlet port; an outlet conduit in fluid communication with said outlet port for conducting away fluid exiting from said outlet port; an inlet conduit coupled to said inlet port and of a smaller diameter than said outlet conduit for conducting fluid into said inlet port, said inlet conduit being coiled around and in thermal transfer relationship with said outlet conduit along a portion of the length thereof; and means in direct thermal transfer relationship with said flow cell housing around which said inlet conduit is coiled in a thermal transfer relationship therewith and disposed between the point of separation of said inlet conduit from said outlet conduit and the connection of said inlet conduit to said inlet port.
Claim 2
Dependent Claim
165 words
In a liquid chromatograph a thermal equilibrating apparatus for equilibrating the temperature of liquid as it passes through a flow cell comprising, in combination: a flow cell housing having an inlet port and an outlet port through which liquid can pass from said inlet port to said outlet port; an outlet conduit in fluid communication with said outlet port for conducting away fluid exiting from said outlet port; an inlet conduit coupled to said inlet port and of a smaller diameter than said outlet conduit for conducting fluid into said inlet port, said inlet conduit being coiled around and in thermal transfer relationship with said outlet conduit along a portion of the length thereof; and means in direct thermal transfer relationship with said flow cell housing around which said inlet conduit is coiled in a thermal transfer relationship therewith and disposed between the point of separation of said inlet conduit from said outlet conduit and the connection of said inlet conduit to said inlet port.
Claim 3
Dependent Claim
34 words
Apparatus as claimed in claim 1 wherein said thermal transfer effecting means includes a member having one end thereof within said housing and another end thereof external said housing and distal said flow cell.
Claim 4
Dependent Claim
14 words
Apparatus as claimed in claim 2 wherein said member is a rigid copper rod.
Claim 5
Dependent Claim
42 words
Apparatus as claimed in claim 1 wherein said helically coiled portion of said inlet conduit about said thermal transfer means has a lead angle in the range of 60 to 70 degrees with respect to the axis of said thermal transfer means.
Claim 6
Dependent Claim
21 words
Apparatus as claimed in claim 1 wherein said inlet conduit is helically wrapped around and in contact with said outlet conduit.
Claim 7
Dependent Claim
45 words
Apparatus as claimed in claim 5 wherein said inlet conduit is helically coiled about said outlet conduit, said coiling lead angle is in the range of 60 to 70 degrees with respect to the axis of said outlet conduit whereby thermal transfer is effected therebetween.
References Cited (Backward Citations)
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US3799250A
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US4248259A
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US4296738A
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US4479727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |