Patents by Inventor James H. Chalmers

James H. Chalmers 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).

  • Simulated targets for detection systems
    Patent number: 4721945
    Abstract: A simulated target for use in conjunction with detection systems using coupled transmission lines. The simulated target is positioned in the vicinity of the transmission line and the response used both to monitor system operation and to calibrate system response levels. The simulated target can be of a type having its electrical length variable under system control or can be purely passive serving to alter the stationary response profile of the system.
    Type: Grant
    Filed: November 14, 1985
    Date of Patent: January 26, 1988
    Assignee: 501 Control Data Canada Limited
    Inventors: Melvin C. Maki, Roger G. Pither, James H. Chalmers