Appeal No. 1996-3017
Application No. 08/851,810
reaction mixture by the presently claimed crystallization
technique. However, as explained by the examiner, Bonzom
discloses that it was known in the art to separate appellant's
alkyl-pyrazines from an aqueous reaction medium by the claimed
steps of separation and recrystallization from water.
Accordingly, based on the collective teachings of the primary
references and Bonzom, we agree with the examiner that one of
ordinary skill in the art would have understood that the
claimed alkyl-pyrazines can be isolated by either the
extraction and distillation techniques disclosed by the
primary references or the recrystallization method disclosed
by Bonzom.
The principal argument advanced by appellant is that
Bonzom utilizes different reactants in preparing alkyl-
pyrazines, namely, acetylene compounds and ammonium
derivatives, and, therefore, "does not disclose, much less
suggest, that his isolation procedure would be viable in any
other reaction system" (page 18 of principal brief). However,
insofar as the reaction schemes of the primary references and
Bonzom result in the same product, an alkyl-pyrazine, in an
aqueous medium, we agree with the examiner that one of
-5-
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 Next
Last modified: November 3, 2007