Appeal No. 1998-1832
Application No. 08/434,331
determine that there is no suggestion that the filtrate remaining from the bleaching of the
pulp be recovered in a separate and distinct recovery system. At most Henricson
suggests that the waste from the bleaching step be combined with a second split stream
having a second sulfur content greater than the first sulfur content from the production
of cellulose pulp. See column 1, lines 56-59, and column 2, lines 17-21. Based upon
the above findings, we conclude that Henricson necessarily requires a mixture of used
bleach chemicals and used cooking chemicals. Accordingly, no separate and distinct
recovery installation is contemplated or suggested by Henricson.
Furthermore, we do not agree with the examiner’s position that even if Henricson
does not teach treating the effluent in a second recovery installation, then such would
have been obvious as taught by Mannbro, Reeve, or Ahlstrom. See Answer, page 4.
We find that Mannbro contains only a single regeneration system which processes
both the oxy-liquor and the black liquor. See column 3, lines 56-59 wherein it states
that the black liquor is regenerated in 13 and 14. We find that the residue of the oxy-
liquor, i.e., the spent liquor from the oxygen delignification stage 9, column 3, lines 63-
65 is led directly to the hydroxide regeneration plants 13 and 14. See column 5, lines
60-62. As stated by Mannbro, ”[b]rown liquor may replace some [of the] white liquor
and is produced in the causticizing plant 14. The brown liquor is obtained by dissolving
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