Patents by Inventor David K. Martell

David K. Martell 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).

  • Traffic congestion monitoring system
    Patent number: 5317311
    Abstract: A traffic congestion monitoring system comprises infra-red monitoring units bolted to the sides of bridges over a motorway network and emitting information as to traffic congestion at their locations, a control center which receives and transmits the information, and paging units in respective vehicles and receiving the information and visually displaying the same upon diagrams of the network or zones thereof.
    Type: Grant
    Filed: September 13, 1990
    Date of Patent: May 31, 1994
    Inventors: David K. Martell, Ian R. Williams