Ex parte MATTIS et al. - Page 6




          Appeal No. 96-0733                                                          
          Application 08/173,805                                                      


          elements such that the expansion of the gel is accommodated in              
          such a fashion that it is not lost when the connectors are mated            
          and will return to its initial position upon demating.  In                  
          particular, the appellants urge that there would have been no               
          reason to make the Chan terminal and separate connector of                  
          elastomeric material because the patentee already had provided              
          for the expansion of the gel by means of a flexible diaphragm.              
          Hindsight, the appellants contend, is the only means by which the           
          one of ordinary skill in the art would have been motivated to               
          modify the Chan device in the manner proposed by the examiner.              


               The guidance provided by our reviewing court with regard to            
          rejections based on obviousness is as follows:  The test for                
          obviousness is what the combined teachings of the prior art would           
          have suggested to one of ordinary skill in the art.  See In re              
          Keller, 642 F.2d 413, 425, 208 USPQ 871, 881 (CCPA 1981).  In               
          establishing a prima facie case of obviousness under 35 U.S.C.              
          § 103, it is incumbent upon the examiner to provide a reason why            
          one of ordinary skill in the art would have been led to modify a            
          prior art reference or to combine reference teachings to arrive             
          at the claimed invention.  See Ex parte Clapp, 227 USPQ 972, 973            
          (BPAI 1985).  To this end, the requisite motivation must stem               

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