Patents by Inventor Jonathan Kwan

Jonathan Kwan 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).

  • Low insertion loss current sense circuit
    Patent number: 6741700
    Abstract: A current sense circuit for sensing a current in a subscriber loop comprising a transformer having a first and second winding coupled for sensing a differential current in a loop, a sense winding for producing a sense current in response to a magnetic flux induced in the transformer due to the differential current, an amplifier circuit for receiving the sense current and wherein the sense current is indicative of a signal on the loop, and the amplifier being configured such that a transformer introduces a low insertion loss at a frequency of operation of the loop.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: May 25, 2004
    Assignee: Catena Networks, Inc.
    Inventor: Jonathan Kwan
  • Electrolytic pyrite removal from kerogen materials
    Patent number: 4043885
    Abstract: An electrolytically active slurry of bituminous, kerogen-containing material is subjected to non-oxidative electrolysis to remove pyrite therefrom.
    Type: Grant
    Filed: August 23, 1976
    Date of Patent: August 23, 1977
    Assignee: University of Southern California
    Inventors: Teh Fu Yen, Chaur-Shyong Wen, Jonathan Kwan