Patents by Inventor Joan E. Landry

Joan E. Landry 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).

  • Fallback method to 1200 bits per second for use in mobile radio
    Patent number: 5450438
    Abstract: In a mobile data communications system, a near-end modem initiates a data connection to a far-end modem at the highest permissible data rate, e.g., at 9600 bits per second (bps). If the communications channel subsequently degrades, either the near-end modem, or the far-end modem, initiates an autorate, or fallback sequence, e.g., to 4800 bps. However, if channel performance is still poor at 4800 bps, then one, or both, of the modems initiate a fallback to 1200 bps--skipping over the data rate of 2400 bps, which is not included within the fallback sequence.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: September 12, 1995
    Assignee: AT&T Corp.
    Inventors: Joan E. Landry, Mahendra Patel, Robert E. Scott