Ex parte LENTZ - Page 5




          Appeal No. 2000-0917                                       Page 5           
          Application No. 09/104,763                                                  


          with respect to the claims under appeal.  Accordingly, we will              
          not sustain the examiner's rejection of claims 1 to 3 and 5 to              
          11 under 35 U.S.C. § 103.  Our reasoning for this                           
          determination follows.                                                      


               In rejecting claims under 35 U.S.C. § 103, the examiner                
          bears the initial burden of presenting a prima facie case of                
          obviousness.  See In re Rijckaert, 9 F.3d 1531, 1532, 28                    
          USPQ2d 1955, 1956 (Fed. Cir. 1993).     A critical step in                  
          analyzing the patentability of claims pursuant to 35 U.S.C. §               
          103 is casting the mind back to the time of invention, to                   
          consider the thinking of one of ordinary skill in the art,                  
          guided only by the prior art references and the then-accepted               
          wisdom in the field.  See In re Dembiczak, 175 F.3d 994, 999,               
          50 USPQ2d 1614, 1617 (Fed. Cir. 1999).  Close adherence to                  
          this methodology is especially important in cases where the                 
          very ease with which the invention can be understood may                    
          prompt one "to fall victim to the insidious effect of a                     
          hindsight syndrome wherein that which only the invention                    
          taught is used against its teacher."  Id. (quoting W.L. Gore &              









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