Patents by Inventor Geoffrey J. A. Baddoo

Geoffrey J. A. Baddoo 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).

  • Patent number: 5323149
    Abstract: A data communications system, e.g. for "hands free" personnel location or access control, comprises a master transceiver and a plurality of slave transceivers for transmitting individual identification messages to the master in accordance with a code in which binary values are represented by an infra-red transmission occuring during a first portion or a second portion of a bit period respectively. The master alternately echoes back to the slaves a binary value corresponding to the value last received. In the event of a clash, however, i.e. different values transmitted from different slaves during the same bit period, the master echoes back only a predetermined single value and the slave(s) which did not transmit that value then cease transmission. This process continues until one of the slaves has transmitted and had echoed back bit-by-bit the whole of its message.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: June 21, 1994
    Assignee: The Racal Corporation Canada Inc.
    Inventors: Nigel S. Hoult, Geoffrey J. A. Baddoo