US5379629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for regulating the carrier gas pressure for separation column arrangements in gas chromatography
Assignee: Siemens AG
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Filing: 1989-02-16
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Granted: 1995-01-10
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Expires: 2009-02-16
Abstract
Abstract PCT No. PCT/DE89/00089 Sec. 371 Date Oct. 15, 1991 Sec. 102(e) Date Oct. 15, 1991 PCT Filed Feb. 16, 1989 PCT Pub. No. WO90/09585 PCT Pub. Date Aug. 23, 1990.A method for stabilizing a pressure differential in a first of two successive gas chromatographic separation columns of a valveless separation column arrangement includes the step of supplying a carrier gas at a controlled pressure to an inlet and outlet of the first separation column. Furthermore, the carrier gas pressure at the inlet of the first separation column is controlled by a command variable formed at least in part from a pressure at the outlet of the first separation column.
Inventors
- 👤 Friedhelm Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:20
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/38; G01N30/46; G01N30/461; G01N30/28; G01N30/32; G01N30/468
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A method for controlling carrier gas pressures in supply lines coupled to an input and output of a first of two serially connected gas-chromatic separating columns of a separating column circuit, said method comprising the step of controlling an input pressure of the first separating column as a function of its output pressure with the effect of maintaining constant the difference between the inlet and outlet pressure of the first separation column.
Claim 2
Independent Claim
72 words
A method for controlling carrier gas pressures in supply lines coupled to an input and output of a first of two serially connected gas-chromatic separating columns of a separating column circuit, said method comprising the step of controlling an input pressure of the first separating column as a function of its output pressure with the effect of maintaining constant the difference between the inlet and outlet pressure of the first separation column.
Claim 3
Independent Claim
79 words
A method for stabilizing a pressure differential in a first of two successive gas chromatographic separation columns of a separation column arrangement comprising the step of: supplying a carrier gas at a controlled pressure to an inlet and outlet of the first separation column; and controlling the carrier gas pressure at the inlet of the first separation column in response to a command variable formed of a first variable and of the outlet pressure of the first separation column.
Claim 4
Independent Claim
79 words
A method for stabilizing a pressure differential in a first of two successive gas chromatographic separation columns of a separation column arrangement comprising the step of: supplying a carrier gas at a controlled pressure to an inlet and outlet of the first separation column; and controlling the carrier gas pressure at the inlet of the first separation column in response to a command variable formed of a first variable and of the outlet pressure of the first separation column.
Claim 5
Dependent Claim
146 words
A separation column arrangement comprising: a first and second carrier gas supply line; a first gas pressure regulator disposed in said first carrier gas supply line; a first separating column having an input coupled to said first regulator by said first supply line; a second gas pressure regulator disposed in said second carrier gas supply line, said first and second regulators each formed by membrane regulators having a spring loaded membrane for mechanically adjusting a command variable; a second separating column coupled to said first separating column at a connecting point, said second regulator also coupled to said connecting point; and a coupling line coupling an output of said second regulator to an input of said first regulator so that said first regulator acts as a differential pressure regulator with a command variable formed of a first variable and an output pressure of said second regulator.
Claim 6
Dependent Claim
146 words
A separation column arrangement comprising: a first and second carrier gas supply line; a first gas pressure regulator disposed in said first carrier gas supply line; a first separating column having an input coupled to said first regulator by said first supply line; a second gas pressure regulator disposed in said second carrier gas supply line, said first and second regulators each formed by membrane regulators having a spring loaded membrane for mechanically adjusting a command variable; a second separating column coupled to said first separating column at a connecting point, said second regulator also coupled to said connecting point; and a coupling line coupling an output of said second regulator to an input of said first regulator so that said first regulator acts as a differential pressure regulator with a command variable formed of a first variable and an output pressure of said second regulator.
Claim 7
Dependent Claim
33 words
The separation column arrangement of claim 3 further comprising a needle valve disposed in a branch of said coupling line open to atmosphere, said needle valve limiting the gas flow through said branch.
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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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |