Appeal No. 2002-1618
Application No. 09/051,746
Claim 43 is representative of the claims on appeal and reads as follows:
43. In a process for the preparation of 1,1,1,3,3-pentafluoropropane
comprising reaction of 1,1,1,3,3- pentachloropropane with hydrogen
fluoride in the presence of a hydrofluorination catalyst, the improvement
which comprises carrying out the reaction at a temperature and under a
pressure at which 1,1,1,3,3-pentafluoropropane is gaseous and isolating
and [sic] 1,1,1,3,3-pentafluropropane from the reaction mixture by drawing
off 1,1,1,3,3-pentafluoropropane and hydrogen chloride in a gaseous
phase as each of said 1,1,1,3,3-pentafluoropropane and hydrogen
chloride is being formed.
The reference relied upon by the examiner is:
Van Der Puy et al. (Van Der Puy) 5,395,997 Mar. 7, 1995
The reference relied upon by the appellants is:
M. Stacey, “The preparation of organic fluorine compounds by halogen exchange,”
Advances in Fluoride Chemistry, Vol. 3, pp. 180-183, 200-209 (1963)
Grounds of Rejection
Claims 43-642 stand rejected under 35 U.S.C. § 103(a) as obvious over Van Der
Puy. We reverse this rejection.
2 The Answer, page 3, indicates that claims 20-26, 28-36 and 44 are rejected,
however, both appellants' Brief, page 2, and the final rejection (Paper No. 19) page 2,
indicate that claims 43-64 are the rejected claims. We treat claims 43-64 as the
rejected claims and subject matter of this appeal.
2
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