US 6,982,007 B2
Divided pressure vessel apparatus for carbon dioxide based systems and methods of using same
Steven L. Worm, Raleigh, N.C. (US); James P. DeYoung, Durham, N.C. (US); James B. McClain, Raleigh, N.C. (US); and David E. Brainard, Wake Forest, N.C. (US)
Assigned to Micell Technologies, Raleigh, N.C. (US)
Filed on Oct. 29, 2003, as Appl. No. 10/695,544.
Application 10/695544 is a division of application No. 09/976551, filed on Oct. 12, 2001, granted, now 6,734,112.
Claims priority of provisional application 60/240473, filed on Oct. 13, 2000.
Prior Publication US 2004/0102042 A1, May 27, 2004
Int. Cl. B08B 3/08 (2006.01); D06F 43/00 (2006.01); H01L 21/302 (2006.01)
U.S. Cl. 134—11 30 Claims
OG exemplary drawing
 
1. A dry cleaning method comprising the steps of:
transferring a first densified gas based dry-cleaning solution from a first liquid chamber defined in a divided working tank to a wash tank containing a dry-cleanable article;
contacting the dry-cleanable article with the first dry-cleaning solution;
returning the first dry-cleaning solution from the wash tank to the divided working tank;
transferring a second densified gas based dry-cleaning solution from a second liquid chamber defined in the divided working tank to the wash tank;
contacting the dry-cleanable article with the second dry-cleaning solution; and
returning the second dry-cleaning solution from the wash tank to the divided working tank;
wherein the first and second liquid chambers share a common vapor space.