Ex Parte CHANG - Page 11


                   Appeal No. 2001-2497                                                              Page 11                      
                   Application No. 08/855,744                                                                                     

                   method depends on the tumor-binding activity and the effector activity (radiolabel                             
                   for imaging, toxin for therapy) being administered at different times, it is essential                         
                   that those activities be carried out by different molecules.                                                   
                          Colcher and Huston, however, disclose or suggest multifunctional proteins                               
                   that both bind to an antigen and carry out the effector function.  Since both                                  
                   functions reside in the same protein, it would appear that the proteins disclosed                              
                   by Colcher and Huston could not be used in the multistep procedure of Goodwin,                                 
                   since there would be no way to administer the tumor-binding part of the protein                                
                   separately from the effector part of the protein.  The examiner has not explained                              
                   how the multifunctional proteins disclosed by Colcher and Huston could be                                      
                   combined with Goodwin’s method in such a way as to yield the instantly claimed                                 
                   invention.                                                                                                     

























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