Patents by Inventor Joe L. Turner

Joe L. Turner 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).

  • Call progress tone system
    Patent number: 4669110
    Abstract: A tone source is located at each telephone set of a private branch exchange (PBX) or a key telephone system. The tone source provides call progress tones and warble ring tone, as well as a feedback tone in response to the depression of telephone set keypad buttons by the user. The signaling to the central system unit is transmitted via a digital link.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: May 26, 1987
    Assignee: ITT Corporation
    Inventors: Hedayat Daie, Charles H. Marsh, Joe L. Turner