Patent ID: 7297371

Claim:
A method of applying a coating to a substrate comprising: providing a deliverable substance in a first pressure vessel, the deliverable substance comprising a coating component interspersed with a fluid component, wherein the fluid component is selected from the group consisting of liquefied carbon dioxide, supercritical carbon dioxide, and mixtures thereof; providing a pressurizing fluid capable of applying pressure to the deliverable substance, wherein the pressurizing fluid is different from the fluid component; allowing the pressurizing fluid to directly apply pressure to the deliverable substance (1) at a pressure of at least vapor pressure of the carbon dioxide if the fluid component comprises liquefied carbon dioxide, or (2) at a pressure of at least critical pressure of the carbon dioxide if the fluid component comprises supercritical carbon dioxide, wherein the pressurizing fluid contacts the deliverable substance in a head space of the first pressure vessel; delivering the deliverable substance to the substrate without substantial variation in composition of the deliverable substance as the first pressure vessel is emptied during delivery thereof.