Patents by Inventor Paul G. Hanson

Paul G. Hanson 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).

  • Voice mail system with improved detection and cancellation
    Patent number: 4885763
    Abstract: A voice mail system includes method and apparatus for muting a previously recorded audio signal upon detection of a DTMF signal to differentiate between recorded DTMF signals and valid DTMF commands. A DTMF signal detected after muting is recognized as an invalid command.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: December 5, 1989
    Assignee: AT&E Corporation
    Inventors: Dennis J. O'Brien, Paul G. Hanson, Thomas D. Klarquist, Bruce C. Nepple, Michael C. Park, Robin R. Rosas