Appeal No. 95-2958
Application 08/108,570
“gas phase fluorination” (page 3) and states that the reaction
temperature “is usually from 250 to 450EC, preferably from 300
to 400EC” (page 4). Appellants state that “[a] reaction
pressure is not limited, but it is usually from 0.1 to 20 atm,
preferably 1 to 10 atm” (see id.). In the only example in
appellants’ specification, both the hydrogen fluoride and
1,1,2,3,4,4-hexachloro-1,3-butadiene reactants are in the gas
phase (page 5).
The boiling range of 1,1,2,3,4,4-hexachloro-1,3-butadiene
is 210-220EC, which is below the temperature range of 250-2
450EC in appellants’ specification (page 4). Although
pressures as high as 20 atm are disclosed in appellants’
specification (see id.), we find no indication that such
pressures would produce a liquid phase. Thus, in view of
appellants’ specification, we conclude that the claims require
that both the hydrogen fluoride and 1,1,2,3,4,4-hexachloro-
1,3-butadiene reactants are in the gas phase. Even if some of
Bielefeldt’s hexachlorobutadiene were to enter the gas phase,
2See The Condensed Chemical Dictionary, 526 (Van Nostrand
Reinhold, 10th ed., 1981).
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