Appeal No. 1995-4804
Application No. 07/861,387
withdrawn from consideration by the examiner as being drawn to
a non-elected invention.
Claim 1, the broadest claim in the application, reads as
follows:
1. A method of treating filtrates from bleach plants for
bleaching cellulosic pulp, including utilizing at least one
ozone bleaching stage, comprising the steps of:
(a) washing the pulp in a washer with a wash liquid prior
to the ozone bleaching stage, the wash liquid including
filtrate from another washing stage of a bleaching stage;
(b) oxidizing the organic material in the filtrate used
as wash liquid in step (a) prior to its use in step (a) in
order to make the organic material less attractive to ozone in
the ozone bleaching stage; and
(c) ozone bleaching the washed pulp in said at least one
ozone bleaching stage.
As evidence of obviousness, the examiner relies on the
following prior art:
Phillips et al. (Phillips) 4,372,812 Feb. 08,
1983
Stawicki 4,543,155 Sep. 24,
1985
Elton 4,806,203 Feb. 21,
1989
Azarniouch et al. (Azarniouch) 5,061,343 Oct. 29,
1991
(Filed May 30,
1990)
Griggs et al. (Griggs) 5,211,811 May 18,
1993
2
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