Ex parte CHANG - Page 5

          Appeal No. 95-0015                                                          
          Application No. 07/869,694                                                  

          and that the sensitizing reaction should take place at a higher             
          temperature than that at which the sensitizer is added (page                
               Appellant argues that in Mihara, all of the compounds                  
          recited in appellant’s claims are added after chemical ripening             
          (brief, page 5).  We are not persuaded by this argument because             
          Mihara teaches that the compounds represented by formulas                   
          (IIa) and (IIb) may be added before the addition of the                     
          sensitizing dyes, and that the sensitizing dyes can be added at             
          any time during the preparation of the emulsion (col. 23, lines             
          59-65; col. 24, lines 21-23).                                               
               Appellant argues that there is no disclosure by Hirabayashi            
          that there is any advantage to adding a mercaptotetrazole at a              
          particular time (brief, page 5).  In view of the teaching by                
          Hirabayashi that such a compound can be added at any time from              
          before forming the silver halide grains to after chemical                   
          ripening but before coating, it would have been prima facie                 
          obvious to one of ordinary skill in the art to add the compound             
          before chemical ripening.                                                   
               Appellant argues that “while the Examiner is correct that              
          there are general teachings of addition of stabilizers to                   
          emulsions prior to chemical ripening, there is no teaching or               


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