Patents by Inventor Colin J Helliwell

Colin J Helliwell 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).

  • Data transmission systems
    Patent number: 5889864
    Abstract: In a data transmission system in which a cyclic redundancy checksum value is derived in respect of each block of data bit values to be transmitted over the system, the checksum value in respect of blocks of data bit values intended for preselected ones only of the stations of the system is preloaded with a predetermined or netkey value to be used by the preselected stations such that only those stations can correctly decode the signals intended for them.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: March 30, 1999
    Assignee: Plessey Semiconductors Limited
    Inventors: Gregory J Smith, Colin J Helliwell