Patents by Inventor Ardell V. Siverhus

Ardell V. Siverhus 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).

  • Method and apparatus for interrogating and identifying fixed or moving targets
    Patent number: 4015259
    Abstract: Hijacked vehicles, or the like, are identified by illuminating a transpon mounted to the vehicle by a beam of microwave energy, e.g., from a helicopter flying over the traffic. The transponder includes non-linear diodes which reradiate a signal back towards the helicopter. Means are disclosed for modulating the return signal with a 16-bit identification code, each bit of which is transmitted as a 31-bit pseudo-random code.
    Type: Grant
    Filed: May 21, 1975
    Date of Patent: March 29, 1977
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ardell V. Siverhus, Joseph A. Matava, Dirk R. Klose