Ex parte KOURTAKIS et al. - Page 3

                Appeal No. 1996-3674                                                                                                      
                Application No. 08/451,826                                                                                                

                unpatentable over Bergna in view of Abrams or Beck as applied to claims 7, 8, 11 and 14, and further                      

                in view of THE CHEMICAL CONDENSED DICTIONARY.  We REVERSE both rejections.                                                

                        In reaching our decision in this appeal, we have given careful consideration to the appellants’                   

                specification and claims and to the respective positions articulated by the appellants and the examiner.                  

                We make reference to the examiner’s answer (Paper No. 11, mailed                                                          

                April 2, 1996) for the examiner’s reasoning in support of the rejection and to the appellants’ brief                      

                (Paper No. 10, filed March 20, 1996) for the appellants’ arguments thereagainst.                                          

                                                           THE INVENTION                                                                  

                        Appellants’ claimed invention is directed to a process for producing an attrition resistant                       

                catalyst composition comprising (1) blending one or more acidic zeolites selected from rho and                            

                chabazite with one or more particulate binders selected from kaolin, bentonite, alpha-alumina, and                        

                titania at a ratio of from about 25 to 75 weight percent, (2) adding the blend to water to yield a slurry of              

                about 10 to about 55 weight percent solids, (3) spray drying the slurry to form microspherical particles                  

                comprising a composite of zeolite and binder, and (4) calcining the particles at temperature of about                     

                500 to 750E C to produce the attrition resistant catalyst composition  (brief, page 3).                                   


                        Bergna discloses acidic zeolite catalysts selected from the group consisting of chabazite,                        

                erionite, ZK-5 and rho which have been modified by depositing thereon at least 0.05 weight % of at                        

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