Appeal No. 1997-2072
Application No. 08/261,544
Both Rains and Nodelman, therefore, do not employ diethyl
toluene diamine or other co-chain extenders, including
hindered amines, in their novel reaction mixtures. See both
Rains and Nodelman in their entirety. Rather, they employ an
organic polyisocyanate (inclusive of the claimed
polyisocyanate) or the claimed polyisocyanate, together with
the claimed polyether polyol, hydroxyl functional organic
material and active hydrogen containing compound. See Rains,
column 2, lines 43-65 and Nodelman, column 2, lines 5-24 and
40-68. These specific reaction mixtures produce molded
articles having a flexural modulus of at least 750,000 psi and
600,000 psi, respectively. See Rains, column 1, lines 38-48
and Nodelman, column 2, lines 32-36 and columns 9 and 10,
Table III. The molded articles can
also “withstand heat over a broad range of temperatures up to
100 C” and have “a Class A surface.” See, e.g., Rains, columno
3, lines 2-6.
Given the fact that both Rains and Nodelman teach away
from using diethyl toluene diamine and other conventional co-
chain extenders, such as hindered amines, we agree with
appellants that the applied prior art references as a whole
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