Patents by Inventor Joseph W. Litterer

Joseph W. Litterer 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).

  • Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones
    Patent number: 4740955
    Abstract: A communications system having a common equipment unit and a plurality of telephone station sets coupled to the common equipment unit comprises a common equipment unit having at least one trunk interface for coupling at least one central office telephone line to the common equipment unit and an analog to digital converter for converting analog signals on the telephone line into digital form, and at least one station interface coupling the common equipment unit to at least one of the station sets by a single wire pair.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: April 26, 1988
    Assignees: TIE/Communications, Inc., Nitsuko Ltd.
    Inventors: Joseph W. Litterer, John E. Anderson, Gary Mason, Minoru Shigematsu, Fumikazu Hamatani