Patents by Inventor Leo J. Blackman

Leo J. Blackman 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).

  • Variable illumination light fixture
    Patent number: 4734837
    Abstract: A variable illumination light fixture which permits the level of illumination of the light fixture to be adjusted not only by dimming or brightening the intensity of the light bulb itself, but also by simultaneously closing off or opening up the fixture's light bulb.
    Type: Grant
    Filed: February 2, 1987
    Date of Patent: March 29, 1988
    Inventors: Lance D. Chantry, Leo J. Blackman