Appeal 2007-2201
Application 10/613,735
According to Appellant, the invention is directed to an apparatus and
method for applying chemicals to substrates through a continuous process
using non-aqueous solvents as a carrier medium for chemicals, with the non-
aqueous solvents being evaporated away leaving the chemicals on the
substrates, and the non-aqueous solvents thereafter being condensed,
purified, and recycled (Br. 2). Independent claim 26 is illustrative of the
invention and a copy of this claim is reproduced below:
26. A method for applying a chemical solution to a substrate,
comprising acts of:
forming a chemical mixture comprising a non-aqueous solvent and a
chemical solute;
applying the chemical mixture to the substrate forming a wet
substrate;
removing the non-aqueous solvent from the wet substrate, leaving the
substrate with remaining chemical solute;
wherein the act of removing the non-aqueous solvent from the wet
substrate comprises acts of:
removing a portion of the chemical mixture from the wet
substrate, leaving a substrate with remaining chemical mixture;
lowering a boiling point of the non-aqueous solvent in the
substrate with remaining chemical mixture; and
evaporating the non-aqueous solvent into a solvent vapor by
passing the substrate with remaining chemical mixture by and against
an evaporator apparatus, such that the evaporator apparatus operates
as a heat plate to evaporate the non-aqueous solvent into a solvent
vapor.
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