Appeal No. 1998-0556
Application No. 08/367,418
11-16.” As a consequence, the only claims now before us on
this appeal are claims 17 through 20.
The subject matter on appeal relates to a method of
controlling the stability of an isomerization dewaxing process
wherein a waxy hydrocarbon fraction is contacted with a
dewaxing catalyst comprising zeolite beta and a noble metal
such as platinum and wherein the method comprises injecting
ammonia into the reactor to contact the catalyst in amounts
sufficient to maintain operating temperatures below 900EF.
The ammonia is injected at at least 1 point, such as at at
least 3 points, along the length of the dewaxer reactor. A
copy of the appealed dependent claims 17 through 20 along with
a copy of nonappealed parent independent claim 11, taken from
the appellants’ brief, is appended to this decision.
The references relied upon by the examiner as evidence of
obviousness are:
LaPierre et al. (LaPierre) 4,419,220 Dec. 6,
1983
Ward et al. (Ward) 4,428,825 Jan. 31,
1984
Claims 17 through 20 stand rejected under 35 U.S.C. § 103
as being unpatentable over Ward in view of LaPierre.
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