Appeal No. 2002-0924
Application 08/876,529
The appellants’ claim 1 requires that the MF5 formed is
isolated.
The examiner relies (answer, pages 4-5) upon example 2 of
DE ‘247 wherein hexafluorophosphoric acid is made by mixing
hydrogen fluoride with phosphorus trichloride in an iron bomb and
gradually adding liquid chlorine to the bomb with cooling. “The
pressure is then gradually allowed to decrease until the escaping
gas, which initially consists only of hydrogen chloride, begins
to color a gas flame palely but clearly through its phosphorus
pentachloride [sic, pentafluoride] content. Then liquid
hexafluorophosphoric acid is found in the pressurized vessel.”
The examiner argues that the title of Wiesboeck
(“Manufacture of Phosphorus Pentafluoride”) indicates that
phosphorus pentafluoride is a desired product in the art, and
argues that one of ordinary skill in the art would have recovered
the DE ‘247 phosphorous pentafluoride for this reason and
because, due to the toxicity of phosphorous pentafluoride, it
cannot be directly released into the atmosphere (answer,
pages 5-6).
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