Source: http://www.google.com/patents/US5378361?dq=5,666,293
Timestamp: 2017-03-27 00:20:09
Document Index: 476079642

Matched Legal Cases: ['art 12', 'art 12', 'art 14', 'art 12', 'art 16', 'art 16', 'art 16', 'art 12', 'art 12']

Patent US5378361 - Axially adjustable chromatography column - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsDescribed is a column for separation of substance mixtures with a liquid. A cylindrical tube has a closure at each end. At least one of the closures is a movable piston. The piston has a socket which is radially expandable by axial pressing of two interacting conical parts for sealing of the piston against...http://www.google.com/patents/US5378361?utm_source=gb-gplus-sharePatent US5378361 - Axially adjustable chromatography columnAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5378361 APublication typeGrantApplication numberUS 08/140,208PCT numberPCT/SE1992/000295Publication dateJan 3, 1995Filing dateMay 6, 1992Priority dateMay 8, 1991Fee statusLapsedAlso published asDE69206800D1, DE69206800T2, EP0588819A1, EP0588819B1, WO1992019346A1Publication number08140208, 140208, PCT/1992/295, PCT/SE/1992/000295, PCT/SE/1992/00295, PCT/SE/92/000295, PCT/SE/92/00295, PCT/SE1992/000295, PCT/SE1992/00295, PCT/SE1992000295, PCT/SE199200295, PCT/SE92/000295, PCT/SE92/00295, PCT/SE92000295, PCT/SE9200295, US 5378361 A, US 5378361A, US-A-5378361, US5378361 A, US5378361AInventorsPeter BaeckstrumOriginal AssigneeBaeckstruem; PeterExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Referenced by (48), Classifications (7), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetAxially adjustable chromatography column
The piston 5 comprises an expandable part 12, made of elastic material such as polytetrafluorethene. Part 12 comprises a collar 13, the periphery of which abuts against the inner surface of the column tube. Collar 13 has an inner surface 13a conically opening with a certain cone angle, e.g. 15° in a column having an inner diameter of 15 mm, and 34° in a column having an inner diameter of 30 mm, and a bottom part 14 integrated with the collar. Via a washer 15 the expandable part 12 is supported against the end of the piston shaft 10 directed towards the separation space. An inner part 16 of the piston 5 has a conical outer surface 17, tapering conically in the direction away from the separation space, said conical outer surface having a greater cone angle, e.g. 30° in a column having the diameter 15 mm and 50° in a column having the diameter 30 mm. The inner part 16 is attached via a threaded central tap 16a engaging an inner thread in the piston shaft. When the inner part 16 is forced into the expandable part 12, the conical surfaces 13a and 17 are brought into contact with each other, whereby part 12 is pressed against the column wall.
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