Appeal No. 1997-3094
Application 08/405,279
Rejection of claim 25 over Wan
Although claim 25 states that the catalyst composition
“comprises” a catalytic material, it states that the catalytic
material “consists of” a combination of bulk ceria and a bulk
second metal oxide. Appellants’ specification states (page
10, lines 23-29) that “[t]he basic and novel characteristics
of the present invention are believed to reside in the use of
the defined combination of ceria and second metal oxide as an
oxidation catalyst without the addition of metal catalytic
components thereto, except as specifically otherwise defined
in certain dependent claims.” Hence, in view of the
specification, we interpret claim 25 as limiting the catalytic
component of the catalyst to only the bulk ceria and second
bulk metal oxide.
Wan discloses a method for treating exhaust from internal
combustion engines, such as automobile and other gasoline
fueled engines, using a catalyst which contains bulk aluminum-
stabilized ceria (col. 1, lines 19-22; col. 8, lines 11-20).
The ceria is stabilized by impregnating it with a liquid
dispersion of any suitable aluminum-stabilizer precursor such
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