Appeal No. 2000-0782
Application No. 08/549,322
chloride, with hydrogen fluoride (HF) in the presence of certain
catalysts (pages 1-2; page 3, l. 12). The resulting product has
one hydrogen atom over and above the original number in the alkene
reactant, and one or more fluorine atoms over and above the number
originally present in the alkene reactant (Rao, page 2, ll. 22-27).
The reaction may be carried out in the liquid phase or vapor phase
(page 3, ll. 13-14). Rao does not teach or exemplify any removal
of the resulting product before the completion of the reaction
(page 4, ll. 7-35; see the Examples on pages 6-8).
Lovelace discloses the addition reaction of hydrogen fluoride
to olefins containing a chlorine atom on a carbon atom of the
double bond, such as vinyl chloride, to produce 1-chloro-1-
fluoroethane, or a difluoroethane product if higher reaction
temperatures and excess hydrogen fluoride are used (page 13).
Lovelace does not disclose or suggest the removal of the product
from the reaction zone.4
D. Comparison of the Prior Art and the Claimed Subject
Matter
In view of our claim construction as discussed above, and the
analysis of the scope and content of the admitted prior art and the
4A discussion of Wairaevens is unnecessary to our decision,
essentially for the reasons stated in the Brief and Reply Brief.
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