Patents by Inventor Russell Jay Apfel

Russell Jay Apfel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Battery switching in a telephone subscriber line interface circuit
    Patent number: 5737411
    Abstract: A telephone subscriber line interface circuit includes a first circuit portion and a second circuit portion, a first battery voltage and a second battery input for receiving a second battery voltage. The second circuit portion is coupled to the second battery input. The telephone subscriber line interface circuit further includes a switch for coupling the first circuit portion to one of the first battery input and the second battery input.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: April 7, 1998
    Assignee: Advanced Micro Devices Inc.
    Inventors: Russell Jay Apfel, Richard Bruce Webb