Patents by Inventor Wilford Eugene Sivertson, Jr.

Wilford Eugene Sivertson, Jr. 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 of locating persons in distress
    Patent number: 4019179
    Abstract: A method for locating any person in distress in a selected area on the surface of the earth who has deployed passive radio frequency (RF) reflectors in a predetermined arrangement. A first transparency is made in the spatial frequency domain of an image of said predetermined arrangement of said RF reflectors. The said selected area of the surface of the earth is scanned by means of a side-looking radar, on board a satellite or aircraft, to produce radar images. Second transparencies in the conventional image domain are produced from the radar images. It is then determined from the first and second transparencies, by means of complex spatial filtering, if RF reflectors in said predetermined arrangement were deployed in said selected area when scanned by said radar.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: April 19, 1977
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Wilford Eugene Sivertson, Jr.