Patent 7588683 was granted and assigned to Agilent Technologies on September, 2009 by the United States Patent and Trademark Office.
A column for liquid chromatography includes a chamber adapted to receive packing medium. Openings in the chamber allow fluid to pass through it. Porous plugs in the chamber retain the packing medium. A piston and one porous plug are movable within the chamber to compress the packing medium. A fitting engages the piston and is adjustably movable for moving the piston.