Appeal No. 1997-1371
Application 08/213,290
1. Griggs does not teach scrubbing the waste stream with an aqueous solution
containing sodium sulfide and sodium hydroxide to –
a. remove ozone and carbon dioxide from the waste stream; and
b. form a scrubbed stream.
2. Griggs does not teach forming the oxygen containing stream for use in the
oxygen delignification stage from at least part of the scrubbed stream.
a. Griggs discloses recycling the aqueous effluent from the ozone
bleaching stage into the oxygen delignification stage (Fig. 4, two lower
schematics; col. 5, lines 22-28; col. 10, lines 50-55; and col. 22, line
30, through col. 23, line 30).
b. In Griggs, however, the spent ozone/oxygen containing stream is
regenerated for reuse in the ozone bleaching stage (Fig. 2, item 70;
col. 20, lines 6-13).
E. The examiner relies on the teachings of Friend to account for the differences
between Griggs and the claimed invention.
1. Friend shows the step of introducing brownstock pulp into an ozone
bleaching stage utilizing an ozone/oxygen containing stream and producing
a waste stream principally containing water vapor, carbon dioxide, ozone,
and oxygen (Fig. 1; col. 4, lines 23-46);
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