Ex parte DALTON et al. - Page 2

          Appeal No. 1996-3990                                        Page 2           
          Application No. 08/145,239                                                   

          atoms with a specified ratio of methyl to non-methyl carbon                  
          atoms.  The weight ratio of component A to B in the claimed                  
          composition is required to be within the range of 10:1 to 1:3.               
          According to appellants (brief, pages 4 and 5), the claimed                  
          composition has improved hydrolytic stability and selectivity                
          in extracting copper values from aqueous solutions of metal                  
          salts.  An understanding of the invention can be derived from                
          a reading of exemplary claim 20, which is reproduced below.                  
               20. A composition for use in extracting copper values                   
          from aqueous solutions of metal salts which comprises                        
                    A) one or more o-hydroxyaryloximes containing at                   
          least     5 aliphatic or alicyclic carbon atoms which are                    
          strong metal extractants which, in 0.2 molar solution in an                  
          aliphatic      hydrocarbon solution when loaded with 50% of the              
          theoretical    uptake of copper, will be in equilibrium with a               
          0.1 molar      solution of copper as copper perchlorate at a pH              
          less than      1: and                                                        
                    B) one or more branched chain aliphatic or                         
          aliphatic-     aromatic esters containing 10 to 30 carbon                    
          atoms, wherein      the ratio of the number of methyl carbon                 
          atoms to the number      of non-methyl carbon atoms is higher                
          than 1:5, the weight     ratio of A to B being in the range                  
          10:1 to 1:3.                                                                 
               The prior art references of record relied upon by the                   
          examiner in rejecting the appealed claims are:                               
          Shanton                  4,567,498                 Jan. 28, 1986             

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