US4093550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Column for high pressure liquid chromatography
Assignee: Honeywell Riedel de Haen AG
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Filing: 1976-06-01
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Granted: 1978-06-06
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Expires: 1996-06-01
Abstract
Abstract In a column for high pressure liquid chromatography (HPLC) consisting of a glass column filled with sorbent concentrically surrounded by a pressure jacket leaving an interspace between the glass column and the pressure jacket, which interspace is sealed at both ends of the glass column and filled with the same medium as flows through the glass column, the pressure in the interspace being equal to the pressure at the inlet of the glass column, the improvement comprises packings surrounding the glass column like stuffing boxes and sealing the interspace between the glass column and the pressure jacket.
Inventors
- 👤 Kurt-Wilhelm Stahl
- 👤 Ekkehard Schuppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:35
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/16; B01D15/163; B01D15/22; G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6052; G01N30/606; G01N30/26; G01N30/28; G01N30/32; G01N30/6004
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
A column for high pressure liquid chromatography (HPLC) having a tube with an inlet and an outlet end and being filled with sorbent, said tube being concentrically surrounded by a pressure jacket so that an interspace between said tube and said pressure jacket is provided, which interspace is filled with the same medium as flows through the internal tube and the pressure in the interspace being equal to the pressure at the inlet of said tube, both ends of said interspace being sealed by means of packings surrounding said tube like stuffing boxes and sealing the interspace between said tube and said pressure jacket, and the interspace is connected by means of a pipe with the inlet end of said tube, a venting means is connected to the interspace, the pipe connected to the interspace opens up in a short pipe, the venting means is disposed on another short pipe mounted on the pressure jacket, and the two short pipes being mounted at opposite ends of the pressure jacket.
Claim 2
Dependent Claim
169 words
A column for high pressure liquid chromatography (HPLC) having a tube with an inlet and an outlet end and being filled with sorbent, said tube being concentrically surrounded by a pressure jacket so that an interspace between said tube and said pressure jacket is provided, which interspace is filled with the same medium as flows through the internal tube and the pressure in the interspace being equal to the pressure at the inlet of said tube, both ends of said interspace being sealed by means of packings surrounding said tube like stuffing boxes and sealing the interspace between said tube and said pressure jacket, and the interspace is connected by means of a pipe with the inlet end of said tube, a venting means is connected to the interspace, the pipe connected to the interspace opens up in a short pipe, the venting means is disposed on another short pipe mounted on the pressure jacket, and the two short pipes being mounted at opposite ends of the pressure jacket.
Claim 3
Dependent Claim
25 words
A column as claimed in claim 1, wherein the packings sealing the interspace between the glass column and the pressure jacket are made of polytetrafluoroethylene.
Claim 4
Dependent Claim
30 words
A column as claimed in claim 1, wherein a difference in length between the pressure jacket and the glass column is compensated by a discharge capillary capable of being shifted.
Claim 5
Dependent Claim
46 words
A column as claimed in claim 1, wherein an axially perforated stopper is inserted within each end of the tube, a capillary tube is inserted into the perforation in each of the stoppers, and each of the stoppers having a cylindrical shaft inserted within the tube.
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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |