Appeal No. 95-2958
Application 08/108,570
Claims 1-3 and 8-17 stand rejected under 35 U.S.C. § 103
over Bielefeldt, Minklei, or these references in combination,
and also over these references individually or in combination,
in view of Fiske.
OPINION
We have carefully considered all of the arguments
advanced by appellants and the examiner and agree with
appellants that the aforementioned rejections are not well
founded. Accordingly, we reverse these rejections.
Bielefeldt discloses a method for the simultaneous
preparation of 2-chloro-1,1,1,4,4,4-hexafluoro-2-butene and
1,1,1,2,4,4,4-heptafluoro-2-butene from hexachlorobutadiene
(col. 1, lines 10-13). Bielefeldt indicates (col. 2, lines
13-24) that the reaction takes place in the liquid phase:
Since at atmospheric pressure hydrogen fluoride
boils at about 20EC., it is necessary, if the
reaction is carried out at temperatures above about
18EC., to work in closed vessels under the particular
autogenous pressure and/or to prevent the
evaporation of hydrogen fluoride by pressurizing
with another gas, for example nitrogen. The
resulting hydrogen chloride can, if necessary, be
released through a pressure-maintaining valve.
In general it is advantageous after the
completion of the reaction to continue stirring for
some time at the final temperature, for example 1 to
3
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