Ex parte UNGER et al. - Page 10

          Appeal No. 1998-1805                                                        
          Application No. 08/596,734                                                  

          one of ordinary skill in the art to modify the pressurized                  
          chamber system of Long by installing additional narrowed                    
          portions, such as, for example, an explicit or implicit                     
          teaching that this would provide an improvement over the                    
          single narrowed portion that is disclosed.                                  
               It is our conclusion that the combined teachings of the                
          two applied references fail to establish a prima facie case of              
          obviousness with regard to the subject matter recited in claim              
          1.  We therefore will not sustain the rejection of claim 1 or,              
          it follows, of claims 3 and 4, which depend therefrom.                      


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