Patent US3915645A successfully refreshed from Google Patents.
US3915645A
Expired / Lapsed
US
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Chemical reaction transducers for use with flueric gas concentration sensing systems
Assignee: United States Department of the Army
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Filing: 1973-04-24
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Granted: 1975-10-28
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Expires: 1993-04-24
Abstract
Abstract A method and an apparatus for the determination of the presence and relative quantity of a reactive component or components in a gas mixture which is based upon the use of flueric gas concentration sensing systems, which give a signal whose frequency is dependent upon the absolute temperature and composition of the gas mixture, by altering the temperature and/or composition of the gas mixture by the alteration of at least one of the components of the gas mixture. The signal generated by gas as altered by a chemical reaction is compared with the signal generated by the unaltered gas or by another modified gas to indicate the change caused by the alteration of the reacted component, thus indicating the presence and relative quantities of this component.
Inventors
- 👤 Maurice F Funke
- 👤 Jr James F Bald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:21
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0013; G01N29/00; G01N29/02; G01N29/024; G01N29/04; G01N29/12; G01N29/22; G01N29/222; G01N2291/00; G01N2291/02; G01N2291/021; G01N2291/0215
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A METHOD OF ANALYZING A MIXED GAS WHICH COMPRISES DIVIDING A STREAM OF THE MIXED GAS INTO TWO PORTIONS FLOWING A FIRST PORTOF THE GAS THROUGH A CONFINED ZONE ALTERING THE COMPOSITION OF THE FIRST PORTION BY CHEMICALLY REACTING EXOTHERMICALLY AT LEAST ONE COMPONENT OF THE MIXED GAS SENSING THE ALTERED GAS AND TRANSDUCING A SIGNAL HAVING A FREQUENCY WHICH IS A FUNCTION OF THE ABSOLUTE TEMPERATURE AND COMPOSITION FLOWING A SECOND PORTION OF THE GAS THROUGH A CONFINED ZONE ALTERING THE COMPOSITION OF THE SECOND PORTION BY CHEMICALLY REACTING ENDOTHERMICALLY AT LEAST ONE COMPONENT OF THE MIXED GAS SENSING THE ALTERED SECOND PORTION AND TRANDUCING A SIGNAL HAVING A FREQUENCY WHICH IS A FUNCTION OF THE ABSOLUTE TEMPERATURE AND COMPOSITION AND COMPARING THE FREQUENCIES OF THE TWO SIGNALS TO INDICATE THE RELATIVE QUANTITY
Claim 2
Independent Claim
134 words
A METHOD OF ANALYZING A MIXED GAS WHICH COMPRISES DIVIDING A STREAM OF THE MIXED GAS INTO TWO PORTIONS FLOWING A FIRST PORTOF THE GAS THROUGH A CONFINED ZONE ALTERING THE COMPOSITION OF THE FIRST PORTION BY CHEMICALLY REACTING EXOTHERMICALLY AT LEAST ONE COMPONENT OF THE MIXED GAS SENSING THE ALTERED GAS AND TRANSDUCING A SIGNAL HAVING A FREQUENCY WHICH IS A FUNCTION OF THE ABSOLUTE TEMPERATURE AND COMPOSITION FLOWING A SECOND PORTION OF THE GAS THROUGH A CONFINED ZONE ALTERING THE COMPOSITION OF THE SECOND PORTION BY CHEMICALLY REACTING ENDOTHERMICALLY AT LEAST ONE COMPONENT OF THE MIXED GAS SENSING THE ALTERED SECOND PORTION AND TRANDUCING A SIGNAL HAVING A FREQUENCY WHICH IS A FUNCTION OF THE ABSOLUTE TEMPERATURE AND COMPOSITION AND COMPARING THE FREQUENCIES OF THE TWO SIGNALS TO INDICATE THE RELATIVE QUANTITY
Claim 3
Dependent Claim
57 words
The method of claim 1 wherein the mixed gas is divided into three portions, flowing a third portion of the mixed gas through a confined zone and transducing a signal which is a function of the absolute temperature and composition of the mixed gas, and comparing this signal with the signals from the first and second portions.
Claim 4
Independent Claim
123 words
An apparatus for analyzing a mixed gas comprising two confined zones, means for inducing a flow of said mixed gas through the confined zones, gas jet edge oscillator means in each confined zone for sensing and transducing a signal having a frequency which is a function of the absolute temperature and composition of the mixed gas passing through said confined zones, means for chemically reacting exothermically a first portion of the mixed gas prior to passing through one of said confined zones, to alter the composition, means for chemically reacting endothermically a second portion of the mixed gas prior to passing through a second confined zone, to alter the composition, and means for comparing the frequencies of the signals from the transducing means.
Claim 5
Independent Claim
123 words
An apparatus for analyzing a mixed gas comprising two confined zones, means for inducing a flow of said mixed gas through the confined zones, gas jet edge oscillator means in each confined zone for sensing and transducing a signal having a frequency which is a function of the absolute temperature and composition of the mixed gas passing through said confined zones, means for chemically reacting exothermically a first portion of the mixed gas prior to passing through one of said confined zones, to alter the composition, means for chemically reacting endothermically a second portion of the mixed gas prior to passing through a second confined zone, to alter the composition, and means for comparing the frequencies of the signals from the transducing means.
Claim 6
Dependent Claim
69 words
Apparatus according to claim 3, comprising three confined zones, wherein two zones include said means to alter the composition and temperature of the gas passing through the zones before reaching the sensors and transducers and wherein the third zone includes jet edge oscillator means to sense the mixed gas, and means for comparing the frequency of the third oscillator means with those of the first and second oscillators means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |