Appeal No. 1998-1405
Application No. 08/379,600
Henderson carries out its sulfiding reaction between a metal
oxide and a carbon disulfide and hydrogen sulfide gas mixture
in the substantial absence of water vapor and oxygen. See
Abstract and column 6, lines 23-28. Although Henderson
recognizes that absolute purity of the components (carbon
disulfide and hydrogen sulfide) of the gas mixture is not
necessary, it suggests using carbon disulfide and hydrogen
sulfide which are substantially pure. See column 5, lines 25-
36, column 9, lines 1-8, and column 10, lines 45-61. Nowhere
does Henderson teach the formation of this substantially pure
carbon disulfide and hydrogen sulfide gas mixture through
reacting elemental carbon with hydrogen sulfide as required by
the claims on appeal.
In order to remedy such a deficiency, the examiner relies
on Johnson. However, Johnson does not teach forming a
substantially pure gas mixture of carbon disulfide and
hydrogen sulfide that can be directly used in the process of
Henderson. Rather, Johnson teaches employing a cheap carbon
source, petroleum coke, with hydrogen sulfide to produce
carbon disulfide which is separated from other impurities,
5
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007