Appeal No. 1997-2974
Application No. 08/288,313
P zeolite on an industrial scale by following the teachings of
the Brown disclosure. Contrary to appellant's argument,
WO '662 makes no such assertion. In discussing the Brown
process, WO '662 states that such process "with such a gel
composition, even though being suitable for producing zeolite
P on a bench scale, can't always be directly transposed to
industrial scale" (page 2, penultimate paragraph, emphasis
added). On page 4, WO '662 states that "[o]ne of the problems
is that the vigourous stirring which can be achieved on a
bench scale, and which allows the formation of zeolite P
instead of zeolite A, can't always be achieved when stirring a
1.5m pool, or bigger" (first paragraph). Consequently, from3
these disclosures of the reference, it seems to us that a fair
interpretation is that the Brown process can't always produce
zeolite P, but sometimes produces mixtures of zeolite P and
zeolite A. This interpretation is further supported by the
disclosure of WO '662 that "it has now been found that it is
in any case impossible to produce pure zeolite P with a gel
dilution n below 250 for a SiO /Al O molar ratio of the gel
2 23
below 2.1 if the gel has a volume of above 1.5m " (page 4,3
first full paragraph). In our view, the evidence relied upon
-6-
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: November 3, 2007