Ex parte HOFFMAN et al. - Page 8

          Appeal No. 1997-0384                                                        
          Application 08/086,498                                                      

          discussed, supra, Hilsum concerns the refresh of a display                  
          element (3  in Figure 3) and not blanking such as used in                   
          scrolling.  Therefore, we find that there is no motivation to               
          combine these references since Hilsum (refreshing) teaches                  
          away from Tsunoda (scrolling), and that to combine these two                
          references in order to achieve appellants’ claimed invention                
          would require the use of hindsight.  Only appellants have                   
          recognized the problem in displays which scroll information                 
          that interference occurs between image frames (see                          
          specification, pages 2 and 4).  Neither Tsunoda nor Hilsum                  
          discusses interference between display elements during a                    
          scrolling operation.                                                        
               We agree with appellants (Brief, page 4) that there would              
          have been no motivation to combine Tsunoda and Hilsum in order              
          to achieve appellants’ recited invention.  We find that the                 
          examiner’s motivation for making the combination in the                     
          statement of the rejection (Answer, page 6) fails to provide                
          an explanation for why the ordinary artisan, looking at                     
          Tsunoda and Hilsum, would have been motivated to blank for an               
          interval proportional to a screen decay rate to reduce                      
          interference during scrolling as recited in the claims on                   

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