US3841059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressed and thermostated air regulated gas liquid chromatography oven with simultaneously operated multiple chromatography columns
Assignee: Individual
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Filing: 1972-09-25
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Granted: 1974-10-15
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Expires: 1992-09-25
Abstract
Abstract The apparatus of the present invention comprises a multiple column gas liquid chromatographic, GLC, oven assymbly for chromatographing a plurality of samples simultaneously. Each of a plurality of GLC columns is contained in a separate small oven whose temperature is independently regulated using a controled flow of compressed and thermostated dry air. Segments of the effluent gas from each of a plurality of GLC columns is passed individually and sequentially to a single detector using a single valve with multiple symmetrically spaced inlets but only two outlets. The effluent gas from all of the GLC columns but one is passed to waste while the effluent gas from one GLC column is passed to a common detector. The valve is repositioned to sequentially pass the effluent gas from each of a plurality of GLC columns to a single detector. The use of a single small valve is made possible by the use of a plurality of micro ovens for individual temperature control of each of a plurality of GLC columns. The use of micro ovens is made possible by the use of compressed and thermostated air as a source of heat for each GLC column oven. This simultaneous operation of a plurality of GLC columns results in a significant increase in the rate of GLC analysis for a plurality of samples.
Inventors
- 👤 W Mccabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:55
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N2030/3084; G01N30/62; G01N2030/628; G01N30/04; G01N30/16; G01N30/20; G01N30/38; G01N30/46; G01N30/466
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
211 words
An apparatus for performing simultaneous gas liquid chromatographic analyses on a plurality of samples comprising a plurality of micro ovens, a chromatography column contained in each of said ovens, said columns having an inlet and outlet means, said inlet having separate conduit means for sample and carrier gas, said outlet having a single conduit means for sample and carrier gas, a segment of conduit means for said carrier gas contained in each of said ovens and connected to the inlet of each of said chromatography columns; a valve assymbly contained in an insulated chamber having an aperature to each of said ovens, said valve assymbly having a plurality of inlets connected by conduit means to the outlet of each of said columns, said valve means containing passage means sequentially connecting one of said columns to a detector means and the other of said columns to a waste outlet means; a chromatography column micro oven, compressed air heating means comprising a tank for holding compressed and thermostated air with a plurality of outlets each connected to one of said ovens, an air temperature and pressure regulating means for said compressed air tank and a plurality of air flow regulating means in the said connections between said tank and each of said ovens.
Claim 2
Independent Claim
211 words
An apparatus for performing simultaneous gas liquid chromatographic analyses on a plurality of samples comprising a plurality of micro ovens, a chromatography column contained in each of said ovens, said columns having an inlet and outlet means, said inlet having separate conduit means for sample and carrier gas, said outlet having a single conduit means for sample and carrier gas, a segment of conduit means for said carrier gas contained in each of said ovens and connected to the inlet of each of said chromatography columns; a valve assymbly contained in an insulated chamber having an aperature to each of said ovens, said valve assymbly having a plurality of inlets connected by conduit means to the outlet of each of said columns, said valve means containing passage means sequentially connecting one of said columns to a detector means and the other of said columns to a waste outlet means; a chromatography column micro oven, compressed air heating means comprising a tank for holding compressed and thermostated air with a plurality of outlets each connected to one of said ovens, an air temperature and pressure regulating means for said compressed air tank and a plurality of air flow regulating means in the said connections between said tank and each of said ovens.
Claim 3
Dependent Claim
40 words
The apparatus of claim 1, wherein the segment of conduit means for said carrier gas comprises a length of folded carrier gas conduit tubing located inside each chromatography column micro oven and connected to the inlet of each chromatography column.
Claim 4
Dependent Claim
44 words
The apparatus of claim 2, wherein the length of folded carrier gas conduit tubing located inside each chromatography column micro oven serves to preheat said carrier gas to the temperature of the said micro oven prior to said carrier gas entering said chromatography column.
Claim 5
Dependent Claim
38 words
The apparatus of claim 1, wherein the micro ovens are each just large enough to contain one chromatography column, a length of folded carrier gas tubing and just sufficient free space for circulation of compressed and thermostated air.
Claim 6
Dependent Claim
64 words
The apparatus of claim 1, wherein the valve assymbly having a plurality of inlets connected by conduit means to the outlet of each of said columns is adjustable to pass a portion of the column effluent carrier gas from each of a plurality of chromatography columns sequentially to a detector means while passing the effluent carrier gas from all other said columns to waste.
Claim 7
Dependent Claim
46 words
The apparatus of claim 1, wherein the insulated chamber for the said column effluent gas valve assymbly contains conduit means for circulation of said compressed and thermostated air around said valve assymbly comprising an aperature to each of said micro ovens and a single exhaust outlet.
Claim 8
Dependent Claim
41 words
The apparatus of claim 1, wherein the air temperature and pressure rEgulating means for said compressed air tank comprises a temperature sensing probe, a heating means, a cooling means, a temperature regulator means and an inlet from a compressed air source.
Claim 9
Dependent Claim
46 words
The apparatus of claim 7, wherein the inlet from a compressed air source contains a pressure regulating means which functions to open or close said inlet depending on the pressure inside said compressed and thermostated air tank and the pressure set on said pressure regulating means.
Claim 10
Dependent Claim
124 words
The apparatus of claim 1, wherein the air flow regulating means between said tank and each of said ovens comprises an air flow regulator valve, a motor-gear drive means to automatically open and close the said air flow regulator valve at one of several preset rates, each corresponding to a different rate of temperature increase inside said chromatography column micro oven, a mechanical stop means to disengage the said automatic motor-gear drive means from the said air flow regulator valve and a separate electrical feedback means to reverse the motor of each said air flow regulator valve motor-gear drive means depending on whether the temperature of the chromatography column is less or greater than the temperature set on a chromatography column temperature regulator means.
Claim 11
Dependent Claim
85 words
The apparatus of claim 9, wherein the electrical feedback means for each said air flow regulator valve motor-gear drive means comprises a motor-gear drive means which functions to vary a thermostat set temperature at various preset rates, a chromatography column temperature sensing probe connected by suitable conduit means to said thermostat, a suitable conduit means between said thermostat means and said air flow regulator valve drive motor, a suitable relay means contained in said conduit means between said thermostat means and said valve drive motor.
Claim 12
Dependent Claim
50 words
The apparatus of claim 10, wherein the suitable relay means functions to reverse the electrical current to the said air flow regulator valve drive motor depending on whether the temperature of the effluent carrier gas from said chromatography column is greater or less than the said thermostat means set temperature.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |