Appeal No. 96-3486
Application No. 08/291,565
catalyst, while enhancing their beneficial effects on
activity” (page 2, lines 26-29). It goes on to say that
“[t]he invention more particularly defined is directed to
step (a) [see claim 1]: atomizing an aqueous suspension
containing at least one mixture of a powder of a
refractory inorganic oxide with a solution of at least
one cerium oxide precursor salt and at least one iron
oxide precursor salt and, optionally, other compounds,
soluble or insoluble, that are part of a composition
suitable to form a porous layer . . . to be deposited on
the substrate. . .” (page 4, lines 16-25).
Atomization, though a conventional3 method for making
powder, contrasts with the prior art techniques for
achieving an incorporation of the refractory inorganic
oxide, and cerium and iron salts. According to
appellants
(specification, page 2, lines 20-24), the prior art
techniques include impregnating the refractory inorganic
oxide. This difference in technique has an implication on
the performance of the catalyst. Tests (specification,
3 Specification, page 8, lines 31-33: “In order to achieve
the atomization step (a) of the process according to the
invention, every conventional apparatus can be used.”
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