Patents by Inventor Yves Ruellan

Yves Ruellan 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).

  • Device for distributing light on an image frame
    Patent number: 6034822
    Abstract: A device uses a divergent lens (7) having a concave surface with a central region (12) and a peripheral region (13) of lower curvature than the central region. The light beam (16) crossing the central region is spread over the entire surface of the image frame (10), thereby avoiding a concentration of light in the central portion thereof, and ensuring a more uniform illumination. The device is useful for large size slide projectors using a xenon arc lamp.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: March 7, 2000
    Assignee: Hardware
    Inventor: Yves Ruellan