Patents by Inventor Stanley P. K. Chum

Stanley P. K. Chum 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).

  • Patent number: 4667319
    Abstract: A novel 3-way digital branching network located at a telecommunications repeater branches digital service channel signals into and out of the digital transmission system. On the drop side a first adder combines the West-to-East and East-to-West digital service channel signals before being converted to analog signals for use by the local service channel equipment. On the insert side the locally generated service channel signals are digitized and then digitally combined with the through path signals by a second and third adder for insertion into the West-to-East and East-to-West digital transmission paths.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: May 19, 1987
    Assignee: GTE Sprint Communications Corporation
    Inventor: Stanley P. K. Chum