Patent US3800593A successfully refreshed from Google Patents.
US3800593A
Expired / Lapsed
US
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Gas sampling apparatus for chromatographs
Assignee: Standard Oil Co
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Filing: 1972-10-03
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Granted: 1974-04-02
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Expires: 1992-10-03
Abstract
Abstract A gas sampling apparatus for use in conjunction with a gas chromatograph in which there are no moving parts in the sample flow path, and the size of the sample is controlled and measured by the pressure differential between the carrier gas and the sample gas and the time for which the sample gas pressure exceeds the carrier gas pressure.
Inventors
- 👤 M Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:53
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
219 words
A gas sampling apparatus for a gas chromatographic unit comprising: A. a carrier gas conduit containing a carrier gas inlet situated at one end of the conduit; B. a pressure regulator disposed in said conduit and in communication with said carrier gas inlet; C. a first tap means in communication with (B) to control carrier gas feed in the carrier gas conduit; D. a chromatographic column having an inlet and an outlet; E. a pressure gauge positioned between and operatively associated with (C) and the inlet of (D) to measure the pressure of the carrier gas at inlet (D); F. a conduit arm extending from (A) at a position between (E) and the inlet of (D); G. a sample gas inlet in said conduit arm and communicating with the inlet of (D) and (E); H. a restrictor means in (F) positioned between (G) and the inlet of (D); I. a second tap means communicating with the outlet of (D) to control the rate of flow of the sample gas in the column; the volume of the sample gas injected into (D) being dependent upon the pressure differential between the pressure of the carrier gas and that of the sample gas at the inlet of (D), and the time for which the sample gas pressure exceeds the carrier gas pressure.
Claim 2
Dependent Claim
219 words
A gas sampling apparatus for a gas chromatographic unit comprising: A. a carrier gas conduit containing a carrier gas inlet situated at one end of the conduit; B. a pressure regulator disposed in said conduit and in communication with said carrier gas inlet; C. a first tap means in communication with (B) to control carrier gas feed in the carrier gas conduit; D. a chromatographic column having an inlet and an outlet; E. a pressure gauge positioned between and operatively associated with (C) and the inlet of (D) to measure the pressure of the carrier gas at inlet (D); F. a conduit arm extending from (A) at a position between (E) and the inlet of (D); G. a sample gas inlet in said conduit arm and communicating with the inlet of (D) and (E); H. a restrictor means in (F) positioned between (G) and the inlet of (D); I. a second tap means communicating with the outlet of (D) to control the rate of flow of the sample gas in the column; the volume of the sample gas injected into (D) being dependent upon the pressure differential between the pressure of the carrier gas and that of the sample gas at the inlet of (D), and the time for which the sample gas pressure exceeds the carrier gas pressure.
Claim 3
Dependent Claim
44 words
The gas sampling apparatus of claim 1 including a slow leak vent and a restrictor element disposed in (A); said slow leak vent by-passing (C) and communicating with (B); and said restrictor element positioned between and communicating with said slow leak vent and (E).
Claim 4
Dependent Claim
102 words
The gas sampling apparatus of claim 2 including a second chromatographic column having an inlet and an outlet, the inlet of said second column communicating with the outlet of (D); and a secondary carrier gas conduit in communication with the outlet of said second chromatographic column, said secondary carrier gas conduit containing a secondary carrier gas entry, a second pressure regulator and a second pressure gauge, said second pressure regulator being situated between and communicating with the secondary carrier gas entry and the second pressure gauge, and the second pressure gauge being in communication with the outlet of said second chromatographic column.
References Cited (Backward Citations)
US3426599A
Cited
US3511080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |