Patent ID: 6743300
Filing Date: 2004-06-01
Classification: B08B

Abstract:
A method of treating an object in a closed circuit solvent processing system, said system including a chamber, a first fluid supply tank in communication with said chamber and a second fluid supply tank in communication with said chamber, said method comprising the steps of:placing an object to be processed in a chamber; sealing said chamber; reducing the pressure within said chamber to evacuate the air from said chamber to create a vacuum condition; introducing a first fluid having a first concentration to said evacuated chamber from a first fluid supply tank to process said object contained in said chamber; recovering and retaining said first fluid from said chamber to return said chamber to said evacuated vacuum condition; introducing a second fluid having a second concentration to said evacuated chamber from a second clean fluid supply tank to process said object contained in said chamber; recovering and retaining said second fluid from said chamber to return said chamber to said evacuated vacuum condition; introducing a non-condensable gas to said chamber to return said chamber to atmospheric pressure; opening said chamber and removing said object; redistributing said first and second fluids to said first and second supply tanks; and returning said first and second fluids to said first and second concentrations and retaining said fluids for use in treating subsequent objects.