THOMPSON et al. V. THOMPSON - Page 28




          Interference No. 103,878                                                    



          ordinary skill in view of the combined teachings from the                   
          above-described prior art.  It is our view, for example, that               
          it would have been obvious to eliminate the glass refractor                 
          and extend the parabolic shade of the NEMA head, described as               
          prior art in the senior party’s patent, in view of the                      
          teaching of the IES disclosure                                              
          that a shade extending past the lamp provides the desirable                 
          “absolute cutoff,” provides more light “up and down the                     
          street,” and further serves to protect the lamp from outside                
          forces.  These teachings from the IES disclosure provide ample              
          express motivation or suggestion for such a modification.                   
                    By the same token, the disclosure of the Hubbell                  
          Highbay fixture and the IES OV-18 Luminaire are evidence of a               
          recognition in the art that in some circumstances a glass                   


          refractor or diffuser on the bottom of a metallic reflector                 
          is not desirable, i.e., when a horizontal light cutoff is                   
          desired both to provide greater downlight and to reduce glare.              
          Accordingly, following this recognized art teaching, it would               
          have been obvious to one of ordinary skill to dispense with                 
          the glass refractor of the GE luminaire or to extend the                    
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