Ex Parte LEON - Page 4


         Appeal No. 1999-2225                                                        
         Application No. 08/815,441                                                  



         establishing a prima facie case of non-enablement under the first           
         paragraph of 35 U.S.C. § 112 rests on the examiner.  In re                  
         Oetiker, 977 F.2d 1443, 1445, 24 USPQ2d 1443, 1444 (Fed. Cir.               
         1992).  The predecessor of our reviewing court has stated as                
         follows:                                                                    
              [A] specification disclosure which contains a teaching                 
              of the manner and process of making and using the                      
              invention in terms which correspond in scope to those                  
              used in describing and defining the subject matter                     
              sought to be patented must be taken as in compliance                   
              with the enabling requirement of the first paragraph of                
              Section 112 unless there is reason to doubt the                        
              objective truth of the statements contained therein                    
              which must be relied on for enabling support.                          
         In re Marzocchi, 439 F.2d 220, 223, 169 USPQ 367, 369 (CCPA                 
         1971).  Thus, it is only upon the advancement of acceptable                 
         reasoning on the part of the examiner that the burden of proving            
         enablement shifts to the appellants.  In re Strahilevitz, 668               
         F.2d 1229, 1232, 212 USPQ 561, 563 (CCPA 1982).  Here, the                  
         examiner has not met the threshold initial burden of proof.                 
              "Although not explicitly stated in section 112, to be                  
         enabling, the specification of a patent must teach those skilled            
         in the art how to make and use the full scope of the claimed                
         invention without 'undue experimentation.'" 1  In re Wright, 999            

              1  The question of whether making and using the invention              
         would have required "undue experimentation" depends on several              
         underlying factual inquiries including: (1) the quantity of                 
         experimentation necessary; (2) the amount of direction or guidance          
         presented; (3) the presence or absence of working  examples; (4)            

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