Ex parte GREEN et al. - Page 7




          Appeal No. 1996-1877                                                        
          Application No. 08/149,716                                                  

          Oetiker, 977 F.2d at 1445, 24 USPQ2d at 1444 ("An observation               
          by the Board that the examiner made a prima facie case is not               
          improper, as long as the ultimate determination of                          
          patentability is made on the entire record."); In re Piasecki,              
          745 F.2d 1468, 1472,  223 USPQ 785, 788 (Fed. Cir. 1984).                   
          Whether the evidence presented suffices to rebut the prima                  
          facie case is part of the ultimate conclusion of obviousness.               


               When a rejection depends on a combination of prior art                 
          references, there must be some teaching, suggestion, or                     
          motivation to combine the references.  See In re Geiger, 815                
          F.2d 686, 688, 2 USPQ2d 1276, 1278 (Fed. Cir. 1987).  Although              
          the suggestion to combine references may flow from the nature               
          of the problem, see Pro-Mold & Tool Co. v. Great Lakes                      
          Plastics, Inc., 75 F.3d 1568, 1573, 37 USPQ2d 1626, 1630 (Fed.              
          Cir. 1996), the suggestion more often comes from the teachings              
          of the pertinent references, see In re Sernaker, 702 F.2d 989,              
          994, 217 USPQ 1, 5 (Fed. Cir. 1983), or from the ordinary                   
          knowledge of those skilled in the art that certain references               
          are of special importance in a particular field, see Pro-Mold,              
          75 F.3d at 1573, 37 USPQ2d at 1630 (citing Ashland Oil, Inc.                

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