US4088458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater block for low cost gas chromatograph
Assignee: DANIEL ELECTRONICS INSTRUMENTATION
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Filing: 1977-02-02
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Granted: 1978-05-09
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Expires: 1997-02-02
Abstract
Abstract In a gas chromatograph assembly, a heat conducting block of relatively large mass has a plurality of cavities formed therein. One cavity houses the chromatographic column; another cavity, extending into close proximity to the first, houses a temperature sensing element; and a third cavity houses a heater. This assembly is secured to a heat transmitting base to which is also secured an explosion-proof housing which houses a detector block. The entire assembly is covered with insulation and the heater block maintains the chromatographic column and the detector block at substantially the same temperature.
Inventors
- 👤 Paul I. Jourdan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:02
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N2030/3084
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
In a gas chromatograph, an assembly comprising: (a) a solid heat conducting block; (b) a first cavity in said block housing a chromatographic column; (c) a second cavity in said block extending into close proximity to said first cavity and housing a temperature sensing element which can transmit an electrical signal whose magnitude is a function of the sensed temperature; and (d) a third cavity extending into close proximity of said second cavity and housing an electrically controllable heating element.
Claim 2
Dependent Claim
80 words
In a gas chromatograph, an assembly comprising: (a) a solid heat conducting block; (b) a first cavity in said block housing a chromatographic column; (c) a second cavity in said block extending into close proximity to said first cavity and housing a temperature sensing element which can transmit an electrical signal whose magnitude is a function of the sensed temperature; and (d) a third cavity extending into close proximity of said second cavity and housing an electrically controllable heating element.
Claim 3
Dependent Claim
43 words
A gas chromatograph assembly as set forth in claim 1 including a fourth cavity in said block receiving a preheating coil for heating a gas to approximately the temperature of said chromatographic column prior to the entry of said gas into said column.
Claim 4
Dependent Claim
136 words
In a gas chromatograph, an assembly comprising: (a) a solid heat conducting block; (b) a first cavity in said block housing a chromatographic column; (c) a second cavity in said block extending into close proximity to said first cavity and housing a temperature sensing element which can transmit an electrical signal whose magnitude is a function of the sensed temperature; (d) a third cavity extending into close proximity of said second cavity and housing an electrically controllable heating element; (e) a heat conducting base; (f) a detector block; (g) an explosion-proof casing surrounding said detector block; and (h) said heat conducting block and said explosion-proof casing mounted on said heat conducting plate in close proximity to one another, whereby said chromatographic column and said detector block are maintained at approximately the same temperature by said heater.
Claim 5
Dependent Claim
136 words
In a gas chromatograph, an assembly comprising: (a) a solid heat conducting block; (b) a first cavity in said block housing a chromatographic column; (c) a second cavity in said block extending into close proximity to said first cavity and housing a temperature sensing element which can transmit an electrical signal whose magnitude is a function of the sensed temperature; (d) a third cavity extending into close proximity of said second cavity and housing an electrically controllable heating element; (e) a heat conducting base; (f) a detector block; (g) an explosion-proof casing surrounding said detector block; and (h) said heat conducting block and said explosion-proof casing mounted on said heat conducting plate in close proximity to one another, whereby said chromatographic column and said detector block are maintained at approximately the same temperature by said heater.
Claim 6
Dependent Claim
43 words
A gas chromatograph assembly as set forth in claim 3 including a fourth cavity in said block receiving a preheating coil for heating a gas to approximately the temperature of said chromatographic column prior to the entry of said gas into said column.
References Cited (Backward Citations)
US3309504A
Cited
US3364659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |