Ex parte KETCHAM et al. - Page 4

                Appeal No. 1997-0448                                                                                                     
                Application No. 08/327,980                                                                                               

                                B.      separating the soluble molybdic oxide from the insoluble molybdenum                              
                                C.      contacting the insoluble molybdenum trioxide with at least one of lime                           
                                        and magnesium hydroxide to form a mixture containing soluble                                     
                                        molybdate values;                                                                                
                                D.      combining the mixture of step C with the soluble molybdic oxide                                  
                                        fraction of step B to form a mixture of soluble molybdenum values;                               
                                E.      contacting the aqueous mixture of step D with an organic solvent                                 
                                        containing an extractive compound that is selective for the molybdenum                           
                                        values such that a majority of the metal contaminants remain in the                              
                                        aqueous mixture while a majority of the molybdenum values are                                    
                                        extracted into the organic solvent;                                                              
                                F.      removing the extracted molybdenum values of step E from the organic                              
                                        solvent with an aqueous solution containing a stripping reagent selective                        
                                        for molybdenum values;                                                                           
                                G.      crystallizing the extracted molybdenum values of step F; and                                     
                                H.      calcining the crystallized molybdenum values of step G to form                                   
                                        molybdenum trioxide of at least technical grade.                                                 

                        The references relied on by the examiner are:                                                                    

                Chiola et al.  (Chiola)                         3,598,519                       Aug. 10, 1971                            
                Barry et al.  (Barry)                           3,656,888                       Apr. 18, 1972                            
                Vertes et al.  (Vertes)                         4,046,852                       Sep.   6, 1977                           
                Sohn                                            4,376,647                       Mar. 15, 1983                            

                I.G. Farbenindustrie                                                                                                     
                Aktiengesellschaft (GB ‘472)                    331,472                         Jul.    3, 1930                          
                        (published Great Britain patent specification)                                                                   

                                                                  - 4 -                                                                  

Page:  Previous  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  Next 

Last modified: November 3, 2007