US3668385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and methods for improving measurements performed upon gaseous samples by reducing sample contamination
Assignee: PCP Inc A CORP OF FLORIDA
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Filing: 1969-10-13
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Granted: 1972-06-06
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Expires: 1989-10-13
Abstract
Abstract Variation of sample concentration, by gain from or loss to the wall of a measurement chamber or sample inlet pipe, is avoided by extracting the central gas core of a streamline sample flow. Measurements are performed upon trace sample components by drift cell techniques.
Inventors
- 👤 Martin J Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:02
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/62; G01N27/622; G01N30/00; G01N30/02; G01N30/62; G01N30/72; G01N30/7206
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
21 words
A method in accordance with claim 1, further comprising admitting a non-reactive gas to said chamber where said ions are separated.
Claim 2
Dependent Claim
25 words
A method in accordance with claim 1, further comprising diverting from said chamber a wall-adjacent portion of the sample gas flow in said inlet pipe.
Claim 3
Dependent Claim
136 words
Apparatus for performing ion analysis measurements upon a gaseous sample, which comprises an ion analysis chamber, means including an inlet pipe for supplying a gaseous sample through said pipe under laminar flow conditions to said chamber, means for extracting a core portion of the sample gas flow in said inlet pipe from the remainder of the sample in said pipe and admitting the same to said chamber, the relationship of the cross-dimensions and length of said pipe with respect to the gaseous flow rate being such as to minimize diffusion between said core and the walls of said pipe , means for forming different-mobility ions from said sample in said chamber, means for separating said ions from each other in accordance with their mobility, and means for detecting at least some of the separated ions ,
Claim 4
Dependent Claim
14 words
Apparatus in accordance with claim 4, said extracting means comprising means defining an aperture.
Claim 5
Dependent Claim
29 words
Apparatus in accordance with claim 5, further comprising means for diverting a portion of the sample flow adjacent to the walls of said inlet pipe away from said aperture.
Claim 6
Dependent Claim
21 words
Apparatus in accordance with claim 4, said chamber having a series of electrodes therein for performing said separating of said ions.
Claim 7
Dependent Claim
22 words
Apparatus in accordance with claim 7, said electrodes being arranged transversely to the direction of sample gas flow in said inlet pipe.
Claim 8
Dependent Claim
23 words
Apparatus in accordance with claim 7, said electrodes being arranged substantially parallel to the direction of sample gas flow in said inlet pipe.
Claim 9
Dependent Claim
17 words
Apparatus in accordance with claim 7, further comprising means for admitting a non-reactive gas to said chamber.
Claim 10
Dependent Claim
24 words
Apparatus in accordance with claim 7, said chamber having outlet means extending transversely from successive portions thereof with electrodes being interposed between said portions.
Claim 11
Dependent Claim
59 words
Apparatus in accordance with claim 4, said chamber being defined within a duct having a sample gas inlet at one end and a sample gas outlet at the other end, said extracting means comprising a longitudinal septum in said duct and a transverse wall for diverting a portion of the sample flowing in the inlet pipe from said chamber.
Claim 12
Dependent Claim
31 words
Apparatus in accordance with claim 12, said duct having an addItional inlet for admitting a non-reactive gas to said chamber at the side of said septum opposite to the sample gas.
Claim 13
Dependent Claim
23 words
Apparatus in accordance with claim 13, said duct having an outlet for said non-reactive gas adjacent to the outlet for said sample gas.
Claim 14
Dependent Claim
52 words
Apparatus in accordance with claim 4, said chamber having a series of electrodes therein for performing said separating of said ions , at least one of said electrodes being in and substantially parallel to the sample gas flow in said chamber and being spaced from an adjacent wall of said chamber .
Claim 15
Dependent Claim
20 words
Apparatus in accordance with claim 15, said one electrode having side edges spaced from adjacent side walls of said chamber.
Claim 16
Dependent Claim
14 words
Apparatus in accordance with claim 15, said electrodes being part of a drift cell.
References Cited (Backward Citations)
US2601097A
Cited
US2959677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |