Appeal No. 95-4865
Application No. 08/240,505
the melting point of the resin; and effecting the
following steps (1) and (2) in either order on the
heat-treated film:
(1) removing the film-forming polymer, and
(2) mounting the film or membrane and sealing an
end of the case with a fluoro-resin so as to form flow
channels through the membrane. [Column 2, lines 2-12;
footnote added.]
There is, however, nothing in Kawai to indicate that the “sheet-
like construction” comprises “a nonwoven paper of thermally
bonded PTFE fibers” as the final end product. To the contrary,
independent claims 1 and 6 of Kawai (which are directed to a
“porous film membrane” (independent claim 1) and a “membrane-type
separator” (independent claim 6)) each expressly contain the
limitation that membrane is “substantially devoid of a
fibrillated portion,” thus clearly indicating that the resultant
sheet-like member contains no fibers whatsoever.
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