Patent ID: 6294194
Filing Date: 2001-09-25
Classification: A61J,A61K,A61M,A61P,B01D,Y02C

Abstract:
A method for extracting supercritical fluid soluble material from one or more cavities or confined spaces in a substrate comprising the steps of:a) exposing the substrate to a supercritical fluid in which said material is substantially soluble but said substrate is not, wherein said supercritical fluid has a critical temperature less than about 200.degree. C. and a critical pressure of less than about 10,000 psi and wherein said substrate is a container selected from the group consisting of vials, bottles, jars, flasks, cylinders, capsules, boxes, tubes, drums and bags; andb) repeatedly modulating the pressure of said supercritical fluid between two or more pressure levels such that the relative difference between the uppermost and lowermost levels of density of said supercritical fluid at such pressure levels is not more than about 30%.