Appeal No. 2002-0924
Application 08/876,529
THE INVENTION
The appellants claim a method for making phosphorous
pentafluoride or arsenic pentafluoride. Claim 1 is illustrative:
1. A method of preparing an inorganic pentafluoride
corresponding to the formula MF5, where M represents P or As,
said method comprising:
reacting a trihalide corresponding to the formula MX3, where
M has the meaning given above and X is chlorine or bromine, with
chlorine, bromine or iodine and with an excess of HF at elevated
pressure and a temperature between -25°C and 100°C in a pressure
vessel, whereby a mixture of MF5 and HX is formed; and
releasing and discharging the mixture from the pressure
vessel as a gaseous mixture and isolating the MF5 formed.
THE REFERENCES
Wiesboeck 3,584,999 Jun. 15, 1971
Jonas (DE ‘247)1 812,247 Aug. 27, 1951
(German patent)
THE REJECTIONS
Claims 1-4 stand rejected under 35 U.S.C. § 103 as being
unpatentable over DE ‘247 in view of Wiesboeck.
OPINION
We reverse the aforementioned rejection. We need to address
only the sole independent claim, i.e., claim 1.
1 Citations herein to this reference are to the English
translation thereof by the Ralph McElroy Translation Co.
(March 1999), which is of record.
2
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