STEITZ V. BENTLEY - Page 4




          Interference No. 103,669                                                    



                                   Burden of Proof                                    
                    The junior party's involved application was filed                 
          during the pendency of the senior party's patent application.               
          Accordingly, for the junior party to prevail in a priority                  
          contest, the junior party must prove priority of invention by               
          a preponderance of the evidence.  See Peeler v. Miller, 535                 
          F.2d 647, 651 n.5, 190 USPQ 117, 120 n.5 (CCPA 1976).  Accord               
          Bosies                                                                      


          v. Benedict, 27 F.3d 539, 541-42, 30 USPQ2d 1862, 1864 (Fed.                
          Cir. 1994).  Cf. Price v. Symsek, 988 F.2d 1187, 1194, 26 USPQ              
          1031, 1036 (Fed. Cir. 1993).                                                
                    The senior party has not put on a case-in-chief.                  
          Therefore, the senior party’s date of invention is his actual               
          filing date, December 5, 1994.                                              


                                Steitz’ Priority Case                                 
                    Conception has been defined as the formation, in the              
          mind of the inventor, of a definite and permanent idea of the               
          complete and operative invention.  Coleman v. Dines, 754 F.2d               


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