Appeal No. 1995-4855
Application No. 08/146,334
starting materials is “an obvious expedient”. See Christoph,
column 4, lines 49-52, where it is taught that “recycle of
unreacted or incompletely converted materials, while desirable
commercially, is not necessary”. Belf teaches recycle of
incompletely converted materials mixed with fresh reactants
(column 2, lines 29-31). Leicester likewise teaches the
separation and return of unreacted starting materials or
incompletely converted reactants into the stream of original
reactants (page 1, right column, line 58-page 2, left column,
line 10). Although Leicester and Belf teach removal of
unreacted HF by a wash (Leicester, page 2, right column, lines
25-44; Belf, column 2, lines 67-68), it would have been
reasonably expected, based on the teachings of the prior art,
to recycle the unreacted material and incompletely converted
material with HF so as to form a new feed.
We do not find in the request any argument convincing us
of error in the conclusions we reached in our Decision.
Accordingly, appellants’ Request for Rehearing is denied.
No time period for taking any subsequent action in
connection with this appeal may be extended under 37 CFR
§ 1.136(a).
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