US4891133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatography apparatus
Assignee: CEREX Corp A CORP OF MARYLAND
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Filing: 1987-09-15
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Granted: 1990-01-02
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Expires: 2007-09-15
Abstract
Abstract Liquid chromatography apparatus including a hollow cylinder and a fixed end closure in which the effective useful length of the cylinder is varied through the use of a piston member that slides within the cylinder due to force exerted by a threaded shaft that is connected to a handle. Binding of the piston member in the cylinder is prevented by a ball joint that operatively connects the piston member to the threaded shaft and by a plurality of O-rings located on the piston member that contact the inner wall of the cylinder and tend to prevent tipping of the piston member. Even liquid distribution and filtering is obtained through a 0.5 micron porous sintered stainless steel liquid distribution disk. A smooth inclined surface in combination with an uninterrupted ring provide a trap for bubbles of gas located inside the cylinder. A composite porous segmented sintered liquid distribution disk is also presented that is particularly useful for large scale liquid chromatography as is the method of manufacturing the composite segmented disk.
Inventors
- 👤 Arthur E. Colvin, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:56
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/52; G01N2030/522; G01N30/60; G01N30/6004; G01N30/6017; G01N30/6021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
Liquid chromatography apparatus comprising an elongated hollow member having two open end portions for receiving a chromatography packing or filling material and end closure means for closing an end of said elongated hollow member having a centrally located aperture for a conduit, said end closure means having means for separating a gas from a liquid comprising an inclined surface and a centrally located substantially uninterrupted ring shaped groove located in said inclined surface close proximity to and around the centrally located conduit aperture with a substantial portion of the inclined surface sloping inward toward said substantially uninterrupted ring shaped groove and the central portion of said closure means and means in fluid communication with said substantially uninterrupted ring shaped groove for drawing off gases from said substantially uninterrupted ring shaped groove, a disk to establish and maintain even liquid distribution radially, and means to vary the position of an end closure means to vary the size of a bed of said packing or filling material.
Claim 2
Dependent Claim
165 words
Liquid chromatography apparatus comprising an elongated hollow member having two open end portions for receiving a chromatography packing or filling material and end closure means for closing an end of said elongated hollow member having a centrally located aperture for a conduit, said end closure means having means for separating a gas from a liquid comprising an inclined surface and a centrally located substantially uninterrupted ring shaped groove located in said inclined surface close proximity to and around the centrally located conduit aperture with a substantial portion of the inclined surface sloping inward toward said substantially uninterrupted ring shaped groove and the central portion of said closure means and means in fluid communication with said substantially uninterrupted ring shaped groove for drawing off gases from said substantially uninterrupted ring shaped groove, a disk to establish and maintain even liquid distribution radially, and means to vary the position of an end closure means to vary the size of a bed of said packing or filling material.
Claim 3
Dependent Claim
21 words
The liquid chromatography apparatus of claim 1 wherein the juncture of said ring and said adjacent sloping surface is substantially uninterrupted.
Claim 4
Dependent Claim
54 words
The liquid chromatography apparatus of claim 1 further comprising liquid distribution means located adjacent said end closure means and wherein said liquid distribution means comprises a segmented disk comprising a substantially circular shaped unitary center segment portion surrounded by a plurality of concentric rings with each ring being formed by substantially identical disk portions.
Claim 5
Dependent Claim
119 words
The liquid chromatography apparatus of claim 3 wherein the substantially identical disk portions each have straight sides extending from the inner surface to the outer surface of a concentric ring and wherein the radius of the center segment is related to the length of the straight sides of the substantially identical disk portions by the following equation: 2R=L.sub.1 =L.sub.2 =L.sub.n where: R is the radius of the center segment, L 1 is-the length of the straight side of a segment in the first concentric ring, L 2 is the length of the straight side of a segment in the second concentric ring, L n is the length of the straight side of a segment in the nth concentric ring.
Claim 6
Dependent Claim
48 words
The liquid chromatography apparatus of claim 1 further comprising a movable piston member located within said elongated hollow member, means for varying the location of said piston member including a shaft, and means connected to said shaft comprising a ball joint for preventing binding of said piston member.
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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) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |