Ex parte TSAI - Page 1

                    THIS OPINION WAS NOT WRITTEN FOR PUBLICATION                      
             The opinion in support of the decision being entered today               
          (1) was not written for publication in a law journal and                    
          (2) is not binding precedent of the Board.                                  
                                                            Paper No. 24              
                      UNITED STATES PATENT AND TRADEMARK OFFICE                       
                         BEFORE THE BOARD OF PATENT APPEALS                           
                                 AND INTERFERENCES                                    
                                Ex parte TED Y. TSAI                                  
                                 Appeal No. 95-0578                                   
                               Application 07/843,8341                                
                              HEARD: September 18, 1997                               
          Before JOHN D. SMITH, WARREN and WALTZ, Administrative Patent               
          WARREN, Administrative Patent Judge.                                        
                                 Decision on Appeal                                   
               This is an appeal under 35 U.S.C. '  134 from the decision of          
          the examiner finally rejecting claims 1 through 5.                          
               The claimed method is an improvement in the delignification            
          of digested chemical cellulosic pulps wherein following                     
          digestion, the pulp is washed with water which is essentially               
          free of dioxins or dioxin precursors in the amount of between               
          about 2 and about 4 tons per ton of pulp to establish a                     
          consistency of the pulp at between about 15% and about 40%, and             
          then subjected to the initial chlorination step which utilizes              
          gaseous chlorine dioxide, gaseous chlorine or a mixture thereof.            
               The references relied on by the examiner are:                          
          1  Application for patent filed February 28, 1992.                          

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