Appeal No. 95-4762
Application No. 08/086,885
DECISION ON APPEAL
This is an appeal under 35 U.S.C. § 134 from the final
rejection of claims 1 through 3, 5, 6, 13 through 20 and 29
through 35.
THE INVENTION
Appellants' invention is directed to a method for
producing an acid anhydride. One of a select group of acids
is contacted with an H ion treated clay for a period of time+
sufficient to undergo anhydration. It is a further requirement
of the claimed invention that the clay has not been treated
with a metal salt. Claim 1 is illustrative of the invention
and is reproduced below.
1. A method for producing an acid anhydride wherein said
anhydride is glutaric anhydride, succinic anhydride,
cyclohexene dicarboxylic acid anhydride, cyclohexane
dicarboxylic acid anhydride, phthalic anhydride or
pyromellitic anhydride, which method comprises bringing into
contact, for a period of time sufficient to produce an acid
anhydride, an acid precursor of said anhydride which is to
undergo anhydration and a clay having a tetrahedron-
octahedron-tetrahedron structure which has undergone one or
more treatments by one or more compounds capable of providing
an H ion to the clay and which has not been treated with a+
metal salt.
THE REFERENCES OF RECORD
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