Ex parte GROSSI et al. - Page 7

          Appeal No. 1997-1992                                       Page 7           
          Application No. 08/115,388                                                  

          cycloalkyl substituted N,N'-dinitrosophenylenediamines.  See                
          In re Zletz, 893 F.2d 319, 321-22, 13 USPQ2d 1320, 1322 (Fed.               
          Cir. 1989).                                                                 
               Turning our attention to the examiner's rejection, we                  
          note that Otsuki and Watanabe are each generally concerned                  
          with inhibiting polymerization of acrylic acids or their                    
          derivatives during purification thereof, Otsuki specifically                
          being directed to such inhibition during distillation of                    
          acrylic or methacrylic acid.  Otsuki discloses that                         
          phenothiazine, appellants' required composition component (b),              
          has polymerization inhibition activity in the liquid phase and              
          that hydroquinone or hydroquinone monomethyl ether,                         
          appellants' optional component (c), have polymerization                     
          inhibition activity in a distillation column when each are                  
          used alone.  Otsuki further teaches that using hydroquinone                 
          monomethyl ether together with benzoquinone provides longer                 
          polymerization suppression than either used alone (Table IV).               
          Otsuki does not teach the use of the claimed N,N'-                          
          dinitrosophenylenediamine compounds alone or in combination                 
          with other compounds for polymerization suppression as claimed              
          herein. While Watanabe discloses N,N'-                                      

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