Ex parte SHRINKLE et al. - Page 5

          Appeal No. 1997-1174                                                        
          Application 08/353,681                                                      

          recognizable 'heart' of the invention."  Para-Ordnance Mfg. v.              
          SGS Importers Int’l, Inc., 73 F.3d 1085, 1087, 37 USPQ2d 1237,              
          1239 (Fed. Cir. 1995) (citing W. L. Gore & Assocs., Inc. v.                 
          Garlock, Inc., 721 F.2d 1540, 1548, 220 USPQ 303, 309 (Fed.                 
          Cir. 1983), cert. denied,                                                   
          469 U.S. 851 (1984)).                                                       
               The Examiner has cited Christner for adaptively                        
          controlling the biasing current applied to MR heads.                        
          According to the Examiner, Christner lessens the difference in              
          the absolute magnitude of the positive and negative peaks, but              
          does not set the peaks to a defined “absolute” magnitude.  The              
          Examiner then combines Christner with Fennema, to obtain                    
          positive and negative peaks of the same absolute amplitude, to              
          increase system precision.  However, since this combination                 
          lacks baseline correction, Cardero is added to the combination              
          for baseline correction, to decrease sensitivity to baseline                
          shifts.  (Final rejection, Paper No. 10, pages 3 and 4.)                    
               Appellants argue that Christner adjusts bias current to                
          the head to thereby minimize, but not eliminate asymmetry, and              
          Christner does not correct for baseline shift (brief-page 6).               


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