Appeal No. 1998-1862
Application No. 08/644,622
obvious for one of ordinary skill in the art to incorporate
the mercaptobenzimi-dazole of Cornell in the form of a zinc
salt in the natural rubber formulations of Wolff. Also, as
pointed out by the examiner, Aoshiuma discloses the addition
of a zinc salt of
2-mercaptobenzimidazole in a rubber composition to prevent
tackiness. Hence, it would have also been obvious to include
zinc salt derivatives of mercaptobenzimidazole in the natural
rubber formulation of Wolff for the benefit disclosed by
Aoshima.
While appellant maintains at page 10 of the principal brief
that Aoshima teaches the use of zinc salts of
mercaptobenzimidazole as anti-tacking agents, not
accelerators, appellant does not claim the zinc salt
derivative as an accelerator. In any event, both Cornell and
Aoshima, as discussed above, provide motivation for one of
ordinary skill in the art to add the zinc salt derivatives to
the rubber composition of Wolff.
Appellant invites attention to Examples 1 and 2 in the
present specification as evidence that “a combination of
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