Patents by Inventor Chet Juall

Chet Juall 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).

  • Ring tone detection for a telephone system
    Patent number: 5442694
    Abstract: A technique for software ring tone detection is disclosed utilizing, in the preferred embodiment, a recursive algorithm. The technique provides flexibility in that a digital signal processor may be reprogrammed to detect ring tone frequencies and amplitudes present in numerous different countries.
    Type: Grant
    Filed: April 12, 1994
    Date of Patent: August 15, 1995
    Assignee: Dialogic Corporation
    Inventors: Prabhakar Chitrapu, Zhibing Pan, Chet Juall, Andrew Dumont