US3756069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analyzer apparatus
Assignee: GOW MAC INSTRUMENT Co
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Filing: 1971-08-04
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Granted: 1973-09-04
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Expires: 1991-08-04
Abstract
Abstract Accuracy of thermal conductivity gas analysis is enhanced by bubbling a sample gas and a reference gas through a common reservoir to saturate the gases at equal temperature and pressure. The saturated gases are maintained at equal pressures and at a temperature exceeding their dew points until the two gases are conveyed past filaments of a thermal conductivity detector cell.
Inventors
- 👤 J Carswell
- 👤 G Gorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:36
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
A gas mixture analyzer comprising a thermal conductivity detector cell having first and second gas chambers, each chamber enclosing a pair of electrical conductors, means for conveying a first gas to the conductors in the first chamber, means for conveying a second gas to the conductors in the second chamber, means for heating the gas conveying means, and a common reservoir interposed in the first and second gas conveying means for saturating the first and second gases at equal temperature and equal pressure.
Claim 2
Dependent Claim
83 words
A gas mixture analyzer comprising a thermal conductivity detector cell having first and second gas chambers, each chamber enclosing a pair of electrical conductors, means for conveying a first gas to the conductors in the first chamber, means for conveying a second gas to the conductors in the second chamber, means for heating the gas conveying means, and a common reservoir interposed in the first and second gas conveying means for saturating the first and second gases at equal temperature and equal pressure.
Claim 3
Dependent Claim
52 words
A gas analyzer in accordance with claim 1, wherein the means for conveying the first and second gases each comprise means for determining the rate of gas flow, and the heating means includes means for heating the rate of flow determining means to a temperature above the dew point of the gases.
Claim 4
Dependent Claim
49 words
A gas analyzer in accordance with claim 1 wherein the common reservoir comprises: means for containing a fluid, first and second collectors, means for bubbling the first gas through the fluid to the first collector, and means for bubbling the second gas through the fluid to the second collector.
Claim 5
Dependent Claim
53 words
A gas analyzer in accordance with claim 3 wherein the means for conveying the first and second gases each comprises means for determining the rate of gas flow therethrough, and the heating means include means for heating the rate of flow determining means to a temperature above the dew point of the gases.
Claim 6
Dependent Claim
44 words
A gas analyzer in accordance with claim 4 wherein the conductors, enclosed in the first and second chambers, interconnect in an electrical bridge circuit for controlling a meter in response to changes of composition of the second gas with respect to the first gas.
Claim 7
Dependent Claim
109 words
A thermal conductivity gas analyzer comprising first and second filaments in a first chamber, third and fourth filaments in a second chamber, means for connecting the first, second, third, and fourth filaments in a bridge circuit, a gas saturator including a common reservoir having a pLurality of paths for saturating gases, means for conveying a first gas at a predetermined rate through one path of the saturator to the first chamber, means for conveying a second gas at the predetermined rate through another path of the saturator to the second chamber, and means interposed along both conveying means for heating the first and second gases above their dew points.
Claim 8
Dependent Claim
109 words
A thermal conductivity gas analyzer comprising first and second filaments in a first chamber, third and fourth filaments in a second chamber, means for connecting the first, second, third, and fourth filaments in a bridge circuit, a gas saturator including a common reservoir having a pLurality of paths for saturating gases, means for conveying a first gas at a predetermined rate through one path of the saturator to the first chamber, means for conveying a second gas at the predetermined rate through another path of the saturator to the second chamber, and means interposed along both conveying means for heating the first and second gases above their dew points.
Claim 9
Dependent Claim
56 words
A gas analyzer in accordance with claim 6 wherein the means for conveying gases each includes: means for emitting the gas into an enclosed column of fluid within the reservoir, means for collecting all of the gas emitted within the column, and fluid means for filling the common reservoir and the columns to a uniform level.
Claim 10
Dependent Claim
44 words
A gas analyzer in accordance with claim 7 wherein the conveying means each comprises means for determining the rate of flow of gas, and the heating means are attached to the rate of flow determining means for heating the gases above their dew points.
Claim 11
Dependent Claim
76 words
A gas mixture analyzer comprising a thermal conductivity detector cell having first and second gas chambers, each chamber enclosing a pair of electrical conductors, means for conveying a first gas to the conductors in the first chamber, means for conveying a second gas to the conductors in the second chamber, and a common reservoir interposed in the first and second gas conveying means for saturating the first and second gases at equal temperature and equal pressure.
Claim 12
Dependent Claim
76 words
A gas mixture analyzer comprising a thermal conductivity detector cell having first and second gas chambers, each chamber enclosing a pair of electrical conductors, means for conveying a first gas to the conductors in the first chamber, means for conveying a second gas to the conductors in the second chamber, and a common reservoir interposed in the first and second gas conveying means for saturating the first and second gases at equal temperature and equal pressure.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |