Patents by Inventor John McBeath

John McBeath 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).

  • Optical inspection apparatus
    Patent number: 5218481
    Abstract: An optical projection system for projecting a magnified image of an object includes a 1:2 relay lens having a magnification of .times.0.5. The object is illuminated by a collimated substantially parallel light beam from a source and the 1:2 relay lens produces an intermediate shadow image at its focal plane. A projection lens is located to project a magnified final image of the intermediate image on the screen. While it is preferred that the relay lens has a magnification of .times.0.5, the relay lens may have a different magnification less than .times.1.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: June 8, 1993
    Assignee: Laroy Optical Limited
    Inventors: John McBeath, Graham Smith