US4004882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analysis diluter
Assignee: Teledyne Monitor Labs Inc
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Filing: 1975-08-14
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Granted: 1977-01-25
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Expires: 1995-08-14
Abstract
Abstract A mass exchange device and system that employs a semi-permeable diffusion barrier in the nature of a tubular membrane. A sample gas stream conduit is concentric with the tubular membrane, and the transport gas stream flows within the tubular membrane in a direction opposite to the flow of transport gas stream. Certain molecular species in the sample gas migrate across the tubular membrane and mix with the transport gas for passage to an analyzer. The conduit and tubular membranes are incorporated within a heat exchange cartridge and a heater and temperature controller maintain a desired temperature control of the system. Dual stream dilutions may be accomplished by sampling an exhaust gas prior to cleansing by a gas scrubber and also sampling the gas after cleansing. Both the upstream and downstream sample gases are diluted in a common heat exchange cartridge and passed to an analyzer.
Inventors
- 👤 James Donald Byrne
- 👤 Paul Arthur Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:30
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/34; G01N1/40; G01N1/4005; G01N2001/4016
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A gas analysis diluter comprising: diffuser barrier means comprising a tubular gas pervious membrane having an inlet end connected to receive a transport gas stream, a conduit surrounding said tubular membrane and having an inlet end connected to receive a sample gas stream, said gas pervious membrane having a large relative mass conductance to a selected molecular species of said sample gas, a transport gas heat exchanger for heating the sample gas to a selected temperature, a sample gas heat exchanger for heating the sample gas to said selected temperature.
Claim 2
Dependent Claim
90 words
A gas analysis diluter comprising: diffuser barrier means comprising a tubular gas pervious membrane having an inlet end connected to receive a transport gas stream, a conduit surrounding said tubular membrane and having an inlet end connected to receive a sample gas stream, said gas pervious membrane having a large relative mass conductance to a selected molecular species of said sample gas, a transport gas heat exchanger for heating the sample gas to a selected temperature, a sample gas heat exchanger for heating the sample gas to said selected temperature.
Claim 3
Dependent Claim
32 words
A gas analysis diluter according to claim 1 wherein: said inlet end of said conduit is at the opposite end of said tubular member than said inlet end of said tubular member.
Claim 4
Dependent Claim
30 words
A gas analysis diluter according to claim 1 wherein: said transport gas and said sample gas heat exchangers, said membrane and said conduit are housed in a common cartridge housing.
Claim 5
Dependent Claim
29 words
A gas analysis diluter according to claim 1 wherein: said transport gas and said sample gas heat exchangers and said conduit are formed in an otherwise solid metal cartridge.
Claim 6
Dependent Claim
26 words
The diluter of claim 1 including: transport gas cleansing means for cleansing the transport gas prior to the admixture with a part of said sample gas.
Claim 7
Dependent Claim
70 words
The diluter of claim 1 wherein the transport gas cleansing means comprises: first filter means for removing particulates from the transport gas; oxidizer means for producing ozone which reacts with nitric oxide in the transport gas for producing nitrogen dioxide; second filter means downstream from the oxidizer means for removing the nitrogen dioxide, and third filter means downstream from second filter means for removing particulates passing the second filter means.
Claim 8
Dependent Claim
25 words
The diluter of claim 1 including: a pump in the sample gas line to exhaust the sample gas which does not migrate past the barrier.
Claim 9
Dependent Claim
43 words
The diluter of claim 1 wherein: said diluter comprises dual dilution branches, the first dilution branch upstream of a gas scrubbing means for diluting uncleansed sample gas, and the second dilution branch downstream of the gas scrubbing means for diluting cleansed sample gas.
Claim 10
Dependent Claim
17 words
The diluter of claim 4, including: temperature sensing means in said cartridge for sensing the temperature thereof.
References Cited (Backward Citations)
US3367850A
Cited
US3545931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |