Interference No. 103,635
et al. (Koyama) has been accorded a priority date of March 13, 1990.4 By virtue of the
earlier priority date of March 13, 1990, Koyama is designated the senior party in this
interference. 37 C.F.R. §§ 1.657 and 1.601(m).
Count 1, the sole count at issue, reads as follows:
Count 1
In a method for producing 1,1,1,2-tetrafluoroethane5 in two reaction stages involving
(1) the reaction of trichloroethylene and hydrogen fluoride to produce 1,1,1-
trifluorochloroethane and (2) the reaction of 1,1,1-trifluorochloroethane with hydrogen
fluoride to produce 1,1,1,2-tetrafluoroethane:
carrying out the reaction (2) between 1,1,1-trifluorochloroethane and hydrogen
fluoride at a temperature in the range of 3000C to 4000C,
carrying out the reaction (1) between 1,1,1-trichloroethylene and hydrogen fluoride
at a temperature in the range of 1800C to 3000C and
recycling unconverted 1,1,1-trifluoroethane with hydrogen fluoride for further reaction
in the presence of trichloroethylene.
or
In a method for producing 1,1,1,2-tetrafluoroethane in two reaction stages involving
(1) the reaction of trichloroethylene and hydrogen fluoride to produce 1,1,1-trifluoro-2-
chloroethane and (2) the reaction of 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride to
produce 1,1,1,2- tetrafluoroethane, the improvement which comprises carrying out the
reaction (2) between 1,1,1-trifluoro-2-chloroethane and hydrogen fluoride at a temperature
in the range of 280-4500 C., carrying out the reaction (1) between trichloroethylene and
hydrogen fluoride at a temperature in the range 2000-4000 C., and below that used in
reaction (2), and recycling unconverted 1,1,1-trifluoro-2-chloroethene [sic] with hydrogen
3 Scott was accorded benefit of U.S. Serial No. 07/676,703, filed March 29, 1991, now abandoned. Order,
paper no. 2, mailed October 5, 1995. Paper No. 1.
4 Koyama was accorded benefit of Japan 2-61811, filed March 13, 1990. Koyama was also accorded benefit
of U.S. Serial Nos. 08/187,520, filed January 28, 1994; 08/009,420, filed January 27, 1993, now U.S. Patent
No. 5,334,786, granted August 2, 1994; 07/912,139, filed July 9, 1992, now abandoned; 07/668,121, filed
March 12, 1991, now abandoned; and Japan 2-285596, filed October 22, 1990. Order, paper no. 2, mailed
October 5, 1995. Paper No. 1.
5 Also known as “R 134a.”
2
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