Ex parte FORDYCE - Page 12

          Appeal No. 96-2551                                                          
          Application 08/037,767                                                      

                    includes a pulse transformer having a primary winding             
                    and a secondary winding across which positive and                 
                    negative secondary pulses are developed when positive             
                    and negative input pulses are provided to the primary             
                    winding following a particular time, means coupled to             
                    the secondary winding for rectifying the secondary                
                    pulses, first and second series-connected capacitors              
                    connected to the rectifying means and first and second            
                    controlled switches each having a control electrode               
                    coupled to the secondary winding of the transformer and           
                    main current path electrodes coupled between the                  
                    capacitors and a control electrode of the power                   
                    transistor, the improvement comprising:                           
                         means coupled to the first capacitor and operable            
                    before the particular time for precharging the first              
                    capacitor including a third controlled switch coupled             
                    between the power source and the first capacitor; and             
                         means coupled between the power transistor and the           
                    third controlled switch for detecting an overcurrent              
                    condition in the power transistor wherein the third               
                    controlled switch is responsive to such overcurrent               
                    detection to turn off the power transistor.                       
          The examiner reads the limitations of claim 10, which is the                
          broader of the two claims, on Landseadel as follows:                        
                    (a) "transformer" - transformer 26;                               
                    (b) "rectifying means" - rectifier circuit 36;                    
                    (c) "capacitor" - capacitors 46 and/or 48;                        
                    (d) "controlled switch" - MOSFET 14 or 22;                        
                    (e) "means for precharging" - resistor 54.                        


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Last modified: November 3, 2007