Ex Parte Nash - Page 8

             Appeal 2007-1293                                                                                         
             Application 10/745,124                                                                                   

                                                  FINDINGS OF FACT                                                    
                              RELATED TO ANTICIPATION BASED UPON LIEDER                                               
                    9. Lieder teaches a telephone interface circuit with a polarity detector.                         
                    (Abstract.)                                                                                       
                    10. Lieder’s circuit includes three main elements, identified as three                            
                    stages ending at nodes A, B, and output respectively.  (Paras. 0015-0020.)                        
                    11. The first stage includes a comparator, item 110, which has a feedback                         
                    resistor, item 103, connected to output, node A, to the inverting input of the                    
                    comparator.  (Fig. 1.)                                                                            
                    12. The output of the comparator, is the output of the first stage, and is                        
                    input to the second stage of the circuit.                                                         
                    13. The second stage is an RC filter consisting of series resistor, item 106,                     
                    and capacitor (to ground), item 130.  (Para. 0016.)                                               
                    14. The second stage RC filter is a low pass filter. (Para. 0016.)                                
                    15. Lieder specifically identifies that a low pass filter is a filter wherein                     
                    the values of the capacitor and resistor are “selected such that all signals                      
                    detected at or above a minimum frequency will be filtered out.”                                   
                    16. The output of the RC filter is input to the third stage which comprises                       
                    a Schmitt trigger.  (Para. 0017.)                                                                 


                                                    ANALYSIS                                                          
                          RELATED TO ANTICIPATION BASED UPON LIEDER                                                   
                    Independent claim 1 recites “an RC delay circuit coupled to the comparator                        
             output … wherein the RC delay circuit has an RC time constant sufficient to                              
             prevent single event transients from adversely affecting the logic device output.”                       

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