Ex parte DEMMIG et al. - Page 4




          Appeal No. 2001-2378                                                        
          Application No. 09/479,932                                                  


          requires that                                                               
               the intermediate layer has a rigidity x such that at                   
               the maximum permissible stress in the rail by                          
               bending generated in response to wheel load, the                       
               intermediate layer has a substantially non-elastic                     
               property, so that further bending of the rail under                    
               additional load causes only insubstantial additional                   
               stress in said rail.                                                   




























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