§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4361482A Expired / Lapsed US ⏱️ 0.0 years remaining

Chromatograph for pressure chromatography

Assignee: D-6230 FRANKFURT AM MAIN 80
•
Filing: 1981-10-07
•
Granted: 1982-11-30
•
Expires: 2001-10-07
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract In this chromatograph for pressure chromatography, a plunger having a plunger stem is arranged so that it can move within the separation column (3). On the front face of the plunger there is a collecting space (7) for liquid, which is covered by a frit (6) and which has a connecting line (8) to the face of the plunger opposed to the front face. In order to prevent abrasive and chemical attack by the column packing on the plunger, its seal and the cylinder wall of the separation column, the plunger should comprise a lower part (2) having a device (4) to accommodate the plunger stem (5), and an upper part (1), the two parts being arranged so that they can move in relation to one another. The upper part (1) has a centering peg (9) which projects into the lower part (2). A spring (12) on which the upper part (1) is supported, is located concentrically in relation to the peg (9). The upper part (1) has recesses on its circumference to accommodate at least two seals (19 and 21) and a ring channel (16) which is formed by a retaining ring (13) for one seal (19) and is connected to the collecting space (7). The other seal (21) is held in its recess by a ring (23) which is located concentrically around the spring and is supported by the lower part.

Inventors

  • 👤 Volker Teetz
  • 👤 Rainer Uhmann
  • 👤 Rudolf Knapp

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 20:20
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/22; G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6004; G01N30/6021; G01N30/26; G01N30/28; G01N30/36

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 183 words
A chromatograph for pressure chromatography, comprising a separation column which has, arranged so that it can move therein, a plunger which has a plunger stem and has, on its front face, a collecting space for liquid, which is covered by a frit and which has a connecting line to the face of the plunger opposite to the front face, wherein the plunger comprises a lower part having a device to accommodate the plunger stem, and an upper part, the two parts being arranged so that they can be moved in relation to one another, the upper part has a centering peg which projects into the lower part, a spring on which the upper part is supported, is located concentrically to the peg, the upper part has recesses on its circumference to accomodate at least two seals and a ring channel which is formed by a retaining ring for one seal and is connected to the collecting space, and the other seal is held in its recess by a ring which is located concentrically around the spring and is supported by the lower part.
Claim 2
Dependent Claim 183 words
A chromatograph for pressure chromatography, comprising a separation column which has, arranged so that it can move therein, a plunger which has a plunger stem and has, on its front face, a collecting space for liquid, which is covered by a frit and which has a connecting line to the face of the plunger opposite to the front face, wherein the plunger comprises a lower part having a device to accommodate the plunger stem, and an upper part, the two parts being arranged so that they can be moved in relation to one another, the upper part has a centering peg which projects into the lower part, a spring on which the upper part is supported, is located concentrically to the peg, the upper part has recesses on its circumference to accomodate at least two seals and a ring channel which is formed by a retaining ring for one seal and is connected to the collecting space, and the other seal is held in its recess by a ring which is located concentrically around the spring and is supported by the lower part.
Claim 3
Dependent Claim 16 words
A chromatograph as claimed in claim 1, wherein a leakage line is fitted between the seals.

References Cited (Backward Citations)

US3487938A Cited
US3966609A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-11-29 1986-05-31 1986-11-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-11-29 1990-05-31 1990-11-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-11-29 1994-05-31 1994-11-30 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag