Patent US4453954A successfully refreshed from Google Patents.
US4453954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly for connecting the column ends of two capillary columns
Assignee: PE Manufacturing GmbH
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Filing: 1983-04-22
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Granted: 1984-06-12
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Expires: 2003-04-22
Abstract
Abstract In gas chromatography, the column ends of two capillary columns are inserted into a straight capillary from both sides forming annular gaps. The capillary is located in a tee out of which the capillary columns are sealingly guided, and to which carrier gas is supplied by means of a flushing flow conduit. A "straight-forward operation" having capillary columns connected in series and a "flush-back operation" are possible. The dead volume between the capillary columns can be kept small.
Inventors
- 👤 Bruno Kolb
- 👤 Peter Pospisil
- 👤 Maria Auer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:20
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/38; G01N30/46; G01N30/461; G01N2030/382; G01N2030/383; G01N30/40; G01N30/60; G01N30/6034
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
Assembly for connecting the column ends of capillary columns by means of a connecting piece in gas chromatography; said assembly comprising: a connecting piece; and a capillary tube positioned with said piece, said capillary tube being adapted to accept therein the ends of capillary columns whereby there is created annular gaps between said columns and said capillary tube.
Claim 2
Dependent Claim
58 words
Assembly for connecting the column ends of capillary columns by means of a connecting piece in gas chromatography; said assembly comprising: a connecting piece; and a capillary tube positioned with said piece, said capillary tube being adapted to accept therein the ends of capillary columns whereby there is created annular gaps between said columns and said capillary tube.
Claim 3
Dependent Claim
12 words
Assembly as claimed in claim 1 wherein said capillary tube is glass.
Claim 4
Dependent Claim
23 words
Assembly as claimed in claim 1 further comprising: means for producing an inwardly directed flushing flow of inert gas through said annular gaps.
Claim 5
Dependent Claim
52 words
Assembly as claimed in claim 3 wherein: said capillary of said connecting piece being disposed in the part corresponding to the transverse beam of a tee, out of which said capillary columns are sealingly guided and of which the part corresponding to the vertical beam is connected to a flushing flow conduit.
Claim 6
Dependent Claim
13 words
Assembly as claimed in claim 4 wherein: said capillary columns are quartz capillaries.
Claim 7
Dependent Claim
15 words
Assembly as claimed in claim 5 wherein: said flushing flow conduit is a metal capillary.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |