Patents by Inventor Frank T. Chen

Frank T. Chen 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).

  • Data transmission network interface unit
    Patent number: 4121217
    Abstract: Disclosed is a data transmission network having an improved interface unit for matching the network to local subscriber loops. It is particularly constructed for the translation of supervisory signals in private and switched line systems. A switched channel logic circuit comprising an assembler and parallel to serial converter is provided for each data channel and these circuits connect to a common logic circuit comprising a combiner in the form of a shifter and a matrix of shift registers.
    Type: Grant
    Filed: August 6, 1976
    Date of Patent: October 17, 1978
    Assignee: Southern Pacific Communications Company (SPCC)
    Inventor: Frank T. Chen