Patent ID: 6932904
Filing Date: 2005-08-23
Classification: B01D,G01N,Y10T

Abstract:
1. A chromatographic device comprising: a tube extending longitudinally along a tube axis, the tube comprising first and second opposite ends, and an inner surface, the inner surface of the tube at least in part defining an intermediate region, the intermediate region being generally between the first and second ends; a chromatographic medium within the intermediate region; a piston assembly within the tube and positioned generally between the first end of the tube and the chromatographic medium, the piston assembly defining a passage for flow of process fluid, the piston assembly comprising a piston body portion; and a locking mechanism adjacent the piston assembly and engaging the inner surface of the tube in a manner to prevent movement of the piston assembly relative to the tube axially toward the first end of the tube without preventing movement of the piston assembly relative to the tube axially toward the second end of the tube.