Patents by Inventor David A. Wilmshurst

David A. Wilmshurst 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).

  • Apparatus for controlling light transmission through a window
    Patent number: 4290473
    Abstract: A device for controlling light transmission through an opening in which a pair of spaced planar parallel films are placed adjacent an opening. The films are selected to have uniformly and linearly varying light transmitting characteristics and are designed to be moved relative to each other, generally in opposite directions, so that a substantially uniform degree of light transmission is achieved over the entire opening area. The films may be either absorptive or reflective and the films may be moved manually or electrically and automatically in response to a sensing and control device.
    Type: Grant
    Filed: January 24, 1979
    Date of Patent: September 22, 1981
    Assignee: Queen's University at Kingston
    Inventors: James G. Pierson, David A. Wilmshurst