Appeal No. 1997-1991 Page 8
Application No. 08/376,270
that is dispersed in water and used as a coating film together
with the teachings of Coogan regarding the formation of a
water dispersible polyurethane made from a water-dispersible
polyurethane prepolymer, an organic polyisocyanate and a chain
extender together with the examiner’s obviousness statements
are not sufficient to establish the prima facie obviousness of
appellants’ methods or composition. This is so since the
examiner has not particularly addressed how the teachings of
Mosbach regarding particular polyisocyanate mixtures that
contain uretdione isocyanate (dimer) which are generally
disclosed as being useful in producing high molecular weight
plastics would have suggested the herein claimed aqueous
dispersion of polyurethane made from isocyanate polyurethane
prepolymer and amine chain extender with or without the
additional disclosure of Coogan. The examiner simply has not
convincingly established how an artisan of ordinary skill
would have been led to modify the method of making the self-
curing water dispersions of polyisocyanates of Mosbach (column
5, lines 13-26 and the examples) to include reactive amounts
of amine chain extenders and a water-dispersible polyurethane
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