Appeal No. 1998-2077
Application 08/553,324
between the ozone treating step and the chelating agent treatment. Other features are described in the
illustrative claim below.
THE CLAIM
Claim 1 is illustrative of appellants’ invention and is reproduced below:
1. Method of treating chemical paper pulp comprising the steps of:
adjusting the pH of the pulp to be between 1 and 6;
treating the pulp with ozone to reduce the kappa number of the pulp;
treating the pulp with a chelating agent after the ozone treating step without any
intervening washing step between the ozone treating step and the chelating agent treating
step;
adjusting the pH of the pulp by adding alkali together with or after the
addition of chelating agent to a pH exceeding 3;
washing the pulp; and
bleaching the pulp with peroxide.
THE REFERENCES OF RECORD
As evidence of obviousness, the examiner relies upon the following references:
Lundgren et al. (Lundgren) 5,310,458 May 10, 1994
Lindberg 5,401,362 Mar. 28, 1995
Backlund et al. (Backlund) 5,415,734 May 16, 1995
2
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007