Patent US4873058A successfully refreshed from Google Patents.
US4873058A
Expired / Lapsed
US
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Flow divider for gas chromatographs
Assignee: Siemens AG
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Filing: 1988-03-01
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Granted: 1989-10-10
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Expires: 2008-03-01
Abstract
Abstract Upstream and downstream flow dividers are connected in series between a sample dispenser and a gas chromatograph separation column. The downstream flow divider is connected to a source of carrier gas, and the system can be backflushed with carrier gas to remove residual quantities of sample material and elute the sample.
Inventors
- 👤 Kraft-Ulrich Arnold
- 👤 Fernand Clauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:17
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/06; G01N30/10; G01N30/26; G01N30/38; G01N30/40; G01N2030/402
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A flow divider system for use in gas chromatographs and adapted to be connected to a sample dispenser, a separation column and a source of carrier gas, comprising: upstream and downstream flow dividers, each having a split chamber, an inlet, an outlet, and a choked port, the inlet of the upstream flow divider being connected to the sample dispenser, the outlet of the upstream flow divider adapted to be connected to the inlet of the downstream flow divider, and the outlet of the downstream flow divider being connected to the separation column; means for connecting and disconnecting the source of carrier gas with the split chamber of the downstream flow divider.
Claim 2
Dependent Claim
111 words
A flow divider system for use in gas chromatographs and adapted to be connected to a sample dispenser, a separation column and a source of carrier gas, comprising: upstream and downstream flow dividers, each having a split chamber, an inlet, an outlet, and a choked port, the inlet of the upstream flow divider being connected to the sample dispenser, the outlet of the upstream flow divider adapted to be connected to the inlet of the downstream flow divider, and the outlet of the downstream flow divider being connected to the separation column; means for connecting and disconnecting the source of carrier gas with the split chamber of the downstream flow divider.
References Cited (Backward Citations)
US3513636A
Cited
US4035168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |