US4286456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas chromatographic chamber
Assignee: Fisons Instruments SpA
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Filing: 1979-08-09
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Granted: 1981-09-01
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Expires: 1999-08-09
Abstract
Abstract A gas chromatographic chamber in the form of an oven is disclosed, including an outer envelope including insulated walls defining the chromatographic chamber which can be made air tight, an inner housing section within that chamber for housing the chromatographic column, and including an air distributor to maintain the uniform distribution of air within the inner housing section, as well as a heater to heat the air therein, non-thermally insulating partitions within the chamber and spaced from the insulated wall to provide a pneumatically insulated space between the insulated walls and the inner housing section, and a fluid circulator to create the controlled circulation of fluid within the pneumatically insulated space to effect the temperature within the inner housing section.
Inventors
- 👤 Giorgio Sisti
- 👤 Ermete Riva
- 👤 Learco Sala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:14
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/025; G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N2030/3084
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A gas chromatographic chamber comprising an outer envelope including insulated wall members defining said chamber which may be closed in an air-tight manner, an inner housing section within said chamber, said inner housing section adapted to include at least one chromatographic column and including inner housing section air distribution means for maintaining a uniform distribution of the air within said inner housing section and inner housing section heating means for heating the air within said inner housing section, non-thermally insulating partition means within said chamber and spaced from said insulated wall members so as to provide a pneumatically insulated space between said insulated wall members and said inner housing section, said non-thermally insulating partition means defining said inner housing section, and circulation means for creating a controlled circulation of fluid within said pneumatically insulated space so as to affect the temperature within said inner housing section.
Claim 2
Dependent Claim
146 words
A gas chromatographic chamber comprising an outer envelope including insulated wall members defining said chamber which may be closed in an air-tight manner, an inner housing section within said chamber, said inner housing section adapted to include at least one chromatographic column and including inner housing section air distribution means for maintaining a uniform distribution of the air within said inner housing section and inner housing section heating means for heating the air within said inner housing section, non-thermally insulating partition means within said chamber and spaced from said insulated wall members so as to provide a pneumatically insulated space between said insulated wall members and said inner housing section, said non-thermally insulating partition means defining said inner housing section, and circulation means for creating a controlled circulation of fluid within said pneumatically insulated space so as to affect the temperature within said inner housing section.
Claim 3
Dependent Claim
46 words
The gas chromatographic chamber of claim 1 including inlet duct and outlet duct means connected to said penumatically insulated space through said insulated wall members whereby a fluid may be circulated through said pneumatically insulated space from said inlet duct means to said outlet duct means.
Claim 4
Dependent Claim
33 words
The gas chromatographic chamber of claim 2 including baffle means located in said pneumatically insulated space for dividing said fluid being circulated through said pneumatically insulated space into a plurality of fluid currents.
Claim 5
Dependent Claim
13 words
The gas chromatographic chamber of claim 2 wherein said fluid comprises ambient air.
Claim 6
Dependent Claim
20 words
The gas chromatographic chamber of claim 2 wherein said fluid comprises a gas maintained at a temperature below ambient temperature.
Claim 7
Dependent Claim
56 words
The gas chromatographic chamber of claim 2 including conduit means for connecting said inlet duct means to said outlet duct means to create a closed circuit including said pneumatically insulated space, and including cooling means located in said closed circuit between said outlet duct means and said inlet duct means for cooling said fluid circulated therethrough.
Claim 8
Dependent Claim
19 words
The gas chromatographic chamber of claim 6 wherein said cooling means comprises a heat exchanger of a refrigeration system.
Claim 9
Dependent Claim
27 words
The gas chromatographic chamber of claim 7 wherein said conduit means includes opening means for selectively permitting connection of said conduit means with a source of air.
Claim 10
Dependent Claim
14 words
The gas chromatographic chamber of claim 8 including a plurality of said opening means.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |