Ex parte SPRANGLE et al. - Page 6




          Appeal No. 97-0128                                                          
          Application No. 08/098,989                                                  


          Montefiore Hospital, 732 F.2d 1572, 1577, 221 USPQ 929, 933                 
          (Fed.                                                                       
          Cir. 1984).  These showings by the Examiner are an essential                
          part                                                                        
          of complying with the burden of presenting a prima facie case               
          of                                                                          
          obviousness.  Note In re Oetiker, 977 F.2d 1443, 1445, 24                   
          USPQ2d                                                                      
          1443, 1444 (Fed. Cir. 1992).                                                
               With respect to independent claims 1, 8, and 10, the                   
          Examiner seeks to modify the free electron laser system of                  
          Brau by asserting the obviousness of supplying the missing                  
          beam quality determining feature.  In the Examiner’s view, the              
          skilled artisan would have found it obvious to determine the                
          quality of the output beam in Brau and to adjust the RF                     
          feedback signal accordingly for the purpose of enhancing the                
          laser output.                                                               
               While Appellants have made several arguments in response,              
          the primary thrust of the arguments centers on the alleged                  
          deficiency of Brau in disclosing any structure which is                     
          responsive to both the generated electron beam and to the                   
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