Ex parte ANDERSON - Page 7

          Appeal No. 1997-2036                                                        
          Application No. 08/335,991                                                  

          15-16), that the court has held in E.I. Du Pont de Nemours &                
          Co. v. Phillips Petroleum Co., 7 USPQ2d 1129 (Fed. Cir. 1988),              
               [i]t is entirely proper to use the specification to                    
               interpret what the Patentee meant by a word or                         
               phrase in the claim.  [citation omitted].  But this                    
               is not to be confused with adding an extraneous                        
               limitation appearing in the specification, which is                    
               improper.  By "extraneous," we mean a limitation                       
               read into a claim from the specification wholly                        
               apart from any need to interpret what the patentee                     
               meant by particular words or phrases in the claim.                     
               (brief, page 16, emphasis in original).                                
          Appellant shows in the drawings chambers with a low aspect                  
          ratio and channels which are long and narrow.  In the                       
          specification (page 14) appellant discloses preferred                       
          dimensions of the channels and chambers.  Although appellant                
          states that the specific size may vary, the preferred                       
          dimensions indicate the relative aspect ratios, which are on                
          the order of 100:1 for channels and 1:1 for chambers.                       
          Accordingly, appellant has clearly distinguished between the                
          two terms, and the examiner cannot arbitrarily treat them as                
          being interchangeable.                                                      
               Returning to Brown's element 81, Brown specifically                    
          refers to it as a channel.  Brown shows channel 81 in the                   


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