Appeal No. 1996-3674
Application No. 08/451,826
unpatentable over Bergna in view of Abrams or Beck as applied to claims 7, 8, 11 and 14, and further
in view of THE CHEMICAL CONDENSED DICTIONARY. We REVERSE both rejections.
In reaching our decision in this appeal, we have given careful consideration to the appellants’
specification and claims and to the respective positions articulated by the appellants and the examiner.
We make reference to the examiner’s answer (Paper No. 11, mailed
April 2, 1996) for the examiner’s reasoning in support of the rejection and to the appellants’ brief
(Paper No. 10, filed March 20, 1996) for the appellants’ arguments thereagainst.
THE INVENTION
Appellants’ claimed invention is directed to a process for producing an attrition resistant
catalyst composition comprising (1) blending one or more acidic zeolites selected from rho and
chabazite with one or more particulate binders selected from kaolin, bentonite, alpha-alumina, and
titania at a ratio of from about 25 to 75 weight percent, (2) adding the blend to water to yield a slurry of
about 10 to about 55 weight percent solids, (3) spray drying the slurry to form microspherical particles
comprising a composite of zeolite and binder, and (4) calcining the particles at temperature of about
500 to 750E C to produce the attrition resistant catalyst composition (brief, page 3).
OPINION
Bergna discloses acidic zeolite catalysts selected from the group consisting of chabazite,
erionite, ZK-5 and rho which have been modified by depositing thereon at least 0.05 weight % of at
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