Patent US3699342A successfully refreshed from Google Patents.
US3699342A
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Method and apparatus for detecting tracer gas
Assignee: Analytical Instruments Ltd
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Filing: 1970-08-13
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Granted: 1972-10-17
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Expires: 1990-08-13
Abstract
Abstract A method and apparatus for detecting the presence of an halogenated tracer gas, which is an electron absorber, in an environment which is itself, or comprises as a constituent, an electron absorber. The apparatus comprises an electron capture detector and the environment to be sampled is first drawn through a membrane which has a greater permeability to the tracer gas than the remainder of the environment before being carried into the detector by a carrier gas. This results in a diminution of the concentration of any electron capture agents present in the environment and which if drawn into the detector could swamp the effect of the tracer gas.
Inventors
- 👤 Anthony Jenkins
- 👤 Richard Charles Cornell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:34
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/06; G01N15/0606; G01N15/0618; G01N27/00; G01N27/62; G01N27/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
A method of detecting and monitoring the presence of an electron capture halogenated tracer gas in a gas supply having as a constituent thereof an electron capture material, comprising the steps of selectively isolating said halogenated tracer gas from the remainder of the supply by diffusion through a membrane formed from a silastomer having a greater permeability to said halogenated tracer gas than to the remainder of the supply, and thereafter conveying the tracer gas into an electron capture detector by means of a gas stream substantially inert to electron capture.
Claim 2
Independent Claim
91 words
A method of detecting and monitoring the presence of an electron capture halogenated tracer gas in a gas supply having as a constituent thereof an electron capture material, comprising the steps of selectively isolating said halogenated tracer gas from the remainder of the supply by diffusion through a membrane formed from a silastomer having a greater permeability to said halogenated tracer gas than to the remainder of the supply, and thereafter conveying the tracer gas into an electron capture detector by means of a gas stream substantially inert to electron capture.
Claim 3
Independent Claim
97 words
An apparatus for detecting and monitoring the presence of an electron capture halogenated tracer gas in a gas supply which is itself, or includes as a constituent, an electron capture material, the apparatus comprising a probe, a membrane at an end of said probe in which the membrane comprises a silastomer having a greater permeability to the halogenated tracer gas than the remainder of the gas supply, means for conveying a carrier gas to the side of the membrane remote from the gas supply and an electron capture detector to receive the carrier gas and tracer gas.
Claim 4
Independent Claim
97 words
An apparatus for detecting and monitoring the presence of an electron capture halogenated tracer gas in a gas supply which is itself, or includes as a constituent, an electron capture material, the apparatus comprising a probe, a membrane at an end of said probe in which the membrane comprises a silastomer having a greater permeability to the halogenated tracer gas than the remainder of the gas supply, means for conveying a carrier gas to the side of the membrane remote from the gas supply and an electron capture detector to receive the carrier gas and tracer gas.
Claim 5
Dependent Claim
44 words
An apparatus according to claim 2, including an outer sheath surrounding the probe and open to the atmosphere at one end, suction means being connected to the other end of the sheath whereby to draw in a sample into the vicinity of the membrane.
References Cited (Backward Citations)
US3361908A
Cited
US3545931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |