Appeal No. 95-3398
Application No. 08/103,318
The claims relate to a hydrophilic copolymer having a cross-
linked hydrophobic copolymer backbone with an acrylic acid or
methacrylic acid monomer polymerized on its surface, so that
carboxylic acid sites are formed on the surface of the
hydrophobic backbone copolymer.
Claims 31 is illustrative and reads as follows:
31. A hydrophilic copolymer comprising a cross-linked
hydrophobic polymer, produced by precipitation polymerization in
a solvent of at least one polyunsaturated ester monomer soluble
therein, the polymer containing a monomer polymerized on the
surface of the hydrophobic polymer, in order to form carboxylic
acid sites on the surface of the hydrophobic polymer, the polymer
being in a form including unit particles of less than about one
micron in average diameter, fused unit particles of sizes in the
range of about twenty to eighty microns in average diameter, and
aggregates of clusters of fused unit particles of sizes in the
range of about two hundred to about twelve hundred microns in
average diameter, the monomer polymerized on the surface being
selected from the group consisting of acrylic acid and
methacrylic acid.
The examiner relies upon the following references of record
as the evidentiary basis for rejecting appellants’ claims:
Albright 3,767,600 Oct. 23, 1973
Frechtling 3,892,822 July 01, 1975
Carmody et al. (Carmody) 4,948,818 Aug. 14, 1990
The following rejections are before us for consideration:
I. Claims 27-34 stand rejected under the judicially created
doctrine of obviousness-type double patenting over claims 1-14 of
Carmody.
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