Patents by Inventor Donald Dean Huizinga

Donald Dean Huizinga 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).

  • Key telephone station set circuit
    Patent number: 4046972
    Abstract: An electronic key telephone station set includes a plurality of nonlocking line selection buttons. Adjacent each button is a pair of light emitting diode lamps, one for indicating which line selection button has been actuated and one for indicating which ones of other lines having an appearance on the station set are in use. Digital data coupled to and from the station set control the activation of the indicating lamps as well as the type of alerting signal generated to indicate an incoming call. Numerous other features may be advantageously implemented under data stream control.
    Type: Grant
    Filed: October 27, 1976
    Date of Patent: September 6, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Donald Dean Huizinga, Edward William Underhill, James Arthur Whitcomb