Ex Parte PRINSSEN - Page 18




          Appeal No. 1997-3267                                                        
          Application 08/324,386                                                      



                                   APPENDED CLAIMS                                    
                    4.  A filtration method for separating liquid and solid           
          materials from a mixture, comprising the steps of:                          
                    providing a pressure chamber containing an endless                
          filter belt and a suction box;                                              
                    supplying a mixture of liquid and solid materials at              
          higher than atmospheric pressure into said pressure chamber on an           
          upper side of said filter belt;                                             
                    connecting said suction box onto an underside of said             
          filter belt; and                                                            
                    maintaining a higher than atmospheric pressure in said            
          pressure chamber and a relatively small difference between the              
          pressure in said pressure chamber and the pressure in said                  
          suction box.                                                                
                    7.  A filtration method for separating liquid and solid           
          materials from a mixture, comprising the steps of:                          
                    providing a pressure chamber containing an endless                
          filter belt and a suction box therein;                                      
                    supplying a mixture of liquid and solid materials on a            
          first side of said filter belt;                                             
                    connecting said suction box to an underside of said               
          filter belt; and                                                            
                    maintaining a higher than atmospheric pressure in said            
          pressure chamber of roughly 20 bar and a relatively small                   
          difference between said pressure in said pressure chamber and the           
          pressure in said suction box when said suction box is connected             
          to the underside of said filter belt.                                       














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