Appeal No. 1997-3609
Application No. 08/483,349
lines 33-37. Nevertheless, the examiner maintains (Answer, p.
4):
It would have been obvious to one of ordinary
skill in the art [at] the time the invention was
made to omit the low molecular weight amine compound
and filler of Dormish because Dormish teaches using
these materials to produce resistance of flow and to
prevent sag. In the event that the adhesive is used
on a horizontal surface, these components aren't
needed.
Appellants urge (Brief, p. 4):
[O]ne or [sic, of] ordinary skill in the art would
not alter the polyurethane composition of the
Dormish et al reference in the necessary manner to
"arrive at" the presently claimed invention. This
reference clearly leads one skilled in the art to
conclude that these diamines and/or triamines are
essential to the invention therein. Without these,
the formulations therein would not exhibit "adequate
resistance to flow" as described at column 3, lines
33-37 and column 8, lines 30-35.
Specifically, Dormish discloses (col. 2, lines 44-68):
It has now surprisingly been found that a two-
component adhesive having advantageous properties
can be prepared using a low viscosity polyisocyanate
component and a low viscosity curative component
containing a blend of a relatively high equivalent
weight component, a relatively low equivalent weight
diol-containing chain extender or crosslinker, and
an amine. In addition, at least one of the two
components must contain a filler, preferably talc.
Although both components according to the invention
are characterized by low viscosities of less than
about 15,000 mPa.s, the mixed adhesive exhibits
excellent resistance to flow, or "sag." In
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