Ex Parte Yamadera et al - Page 4

                Appeal 2007-2242                                                                                 
                Application 10/352,997                                                                           
                Molybdenum (Mo), 2.0-5.0 % of Tungsten (W), and 0.13-0.30% of Nitrogen                           
                (N) (Lee, p. 16, ll. 3-5).1                                                                      
                       4. Lee teaches that, with regard to Cu, “[p]articularly, in the duplex                    
                stainless steel which contains 22.5-23.5% of Cr, the impact toughness is                         
                improved by adding Cu” (Lee, p. 4, ll. 31-32).                                                   
                       5. Lee teaches that, with regard to Cu, “it is preferable to limit the                    
                content of Cu to less than 2.0%, and more preferably to less than 1.0%”                          
                (Lee, p. 4, l. 33)                                                                               
                       6. Lee teaches that, with regard to Ni, “the content of Ni should                         
                preferably be limited to 5-8%” (Lee, p. 4, ll. 38-39).                                           
                       7. Lee teaches that, with regard to Ni, “if the content of Ni departs                     
                from the proper range, the ratio of the austenite phase to the ferrite phase is                  
                disturbed, with the result that the duplex stainless steel loses its intrinsic                   
                properties” (Lee, p. 4, ll. 34-36).                                                              
                       8. Lee teaches that, with regard to Cr, “if [the content of Cr] exceeds                   
                27%, the precipitation rate of intermetallic compounds becomes faster, with                      
                the result that the corrosion resistance and the impact toughness are                            
                decreased” (Lee, p. 4, ll. 41-43).                                                               
                       9. Lee teaches that, with regard to N, “the content of N should be                        
                preferably limited to 0.13-0.27%.  However, if the content of S is less than                     
                0.002%, the content of N can be increased up to 0.3%” (Lee, p. 4, ll. 57-58).                    



                                                                                                                
                1 We take “mass %” and “weight %” to be proportionately equivalent terms.                        
                In so doing, we follow the Applicants and the Examiner, who have not                             
                distinguished the two measures.                                                                  
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