Patents by Inventor Donald W. Burtis

Donald W. Burtis 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).

  • Portable communications and data terminal having multiple modes of operation
    Patent number: 6434395
    Abstract: A portable radio telephone handset includes the capability of operating as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation are available in the handset, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode. A paging function for incoming analog cellular communication is carried out on a CDPD channel. The handset distinguishes between paging signals identifying CDPD mode communications and paging signals identifying analog cellular communications. The handset automatically preempts CDPD communications in favor of analog cellular communications such as those carried out in an AMPS configuration.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: August 13, 2002
    Assignee: Pacific Communications Sciences, Inc.
    Inventors: Michael L. Lubin, Seton P. Kasmir, Kathryn A. Kubasak, Gregory A. Hein, Surendra B. Mandava, Chanchai Poonpol, Shahin Hedayat, Donald W. Burtis