Appeal No. 1997-2974
Application No. 08/288,313
i. mixing a sodium
aluminate solution
having a
temperature of at
least 60EC with a
sodium silicate
solution at a
temperature of at
least 60EC in a
stirred vessel of
2m volume or more,3
in the presence of
a slurry of P
zeolite seed to
form a gel having
the composition,
A1 O :(1.80-2.2)SiO :(1.5-5)Na O:
23 2 2
(40 to 150) H O
2
ii. ageing the gel at a
temperature above
about 60EC with
stirring to
maintain solids in
suspension for a
period of at least
about 0.1 hour,
iii. separating the P
zeolite product,
washing the
separated P zeolite
product and drying
the same.
The examiner relies upon the following references as
evidence of obviousness:
Vaughan et al. (Vaughan) 4,178,352 Dec. 11, 1979
Brown et al. (Brown) 0,384,070 Aug. 29, 1990
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