Chromatographic column with improved seals

Claim 1

A chromatographic column comprising in combination: (1) a tubular column cartridge having at least one end threaded exteriorly and the interior of said end being arranged to receive one end of a seal member, (2) a column seal member attachable to said at least one end of said column cartridge and comprising: a. a body circular in cross-section and having a central straight-through passage from end-to-end of uniform diameter and also having opposite end portions, b. an annular rib on said body intermediately of the end portions thereof and provided with opposed surfaces to be clamped, c. one end portion of said body being substantially cylindrical and complementary to and receivable within said one end of said column cartridge, d. the other end portion of said body being frusto-conical and tapering away from said rib, (3) an apertured coupling having a cavity in one end complementary to the exterior of said other end portion of said body and adapted to receive the same in sealing relationship, (4) a seat in said cavity, and (5) threads in the cavity of said coupling complementary to the exterior threads on said one end of said column and operable to threadably receive the same and connect at least one end of said column cartridge to the cavity end of said coupling in a manner to clamp the annular rib of said seal member to said column cartridge and said coupling by the clamping surfaces of said annular rib being clampingly engaged between said threaded end of said column cartridge and said seat in the cavity of said coupling and said frusto-conical end of said seal member closely filling said cavity inwardly from said seat therein.