Ex parte CHANG - Page 3

          Appeal No. 95-0015                                                          
          Application No. 07/869,694                                                  

          specified benzothiazolium salt or hydrolyzed benzothiazolium salt           
          and a specified mercaptobenzotetrazole and then heating to                  
          complete the chemical sensitizing.                                          
               Mihara discloses a method for spectrally sensitizing silver            
          halide grains by including in an emulsion containing the grains             
          at least one specified sensitizing dye in combination with at               
          least one compound represented by Mihara’s formula (IIa) or (IIb)           
          (col. 1, line 8-14; col. 2, line 65 - col. 4, line 30).  When Y             
          in Mihara’s formulas (IIa) and (IIb) is sulfur, these formulas              
          can represent compounds which are represented by, respectively,             
          formulas (B) and (A) in appellant’s claim 1.  Mihara teaches that           
          known antifoggants including 1-phenyl-5-mercaptotetrazole, which            
          is among the mercaptobenzotetrazoles encompassed by formula (C)             
          in appellant’s claim 1, can be added to the emulsion (col. 29,              
          lines 43-52).                                                               
               Mihara indicates that silver halides generally, including              
          silver iodobromide and silver bromide, can be used in the method            
          (col. 28, lines 14-23), but does not disclose use of tabular                
          silver bromoiodide or silver bromide grains doped with selenium             
          or iridium.  To remedy this deficiency, the examiner relies upon            
          Johnson, which teaches that silver halide emulsions doped with              
          iridium and selenium during crystal growth exhibit reduced                  


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