Ex parte VAN ROSSEN - Page 5

          Appeal No. 1998-3001                                                        
          Application No. 08/318,645                                                  

               Independent claim 8 specifies a method for producing a                 
          dust bag comprising, inter alia, providing a first layer of                 
          air-permeable filter material and a second layer of air-                    
          permeable material resistant to mechanical stresses, the                    
          second layer being narrower than the first layer, placing a                 
          third layer of air-permeable filter material on the second                  
          layer, and welding the sequence of layers together along a                  
          continuous edge line.                                                       

               We fully comprehend the examiner’s assessment of the                   
          applied teachings and how the examiner perceives that the                   
          evidence of obviousness would have been suggestive of the                   
          claimed invention.                                                          
          However, as more specifically explained below, we are of the                
          view that, absent appellant’s own teaching and reliance upon                
          hindsight, the applied patents themselves simply would not                  
          have been suggestive of the claimed dust bag and method.                    

               The Gin patent teaches a filter bag formed by seaming a                
          suitable layered fabric 50 that includes an inner micro-fiber               
          layer 51 and first and second outer support layers.  The                    

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