Patents by Inventor Joel D. Gruber

Joel D. Gruber 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 color synthesizer
    Patent number: 5262895
    Abstract: A color synthesizing device for generating a plurality of hues of color from visible light employing a beam splitter system to split the light into the three primary colors, mechanical attenuators to independently attenuate the primary color and light beams, and a recombination system to recombine the light beams to obtain the desired color hue of light.
    Type: Grant
    Filed: November 19, 1991
    Date of Patent: November 16, 1993
    Inventors: Thomas F. LaDuke, Joel D. Gruber
  • Color changing device
    Patent number: 5044730
    Abstract: The present invention is a device for generating a plurality of colors of light from a light source. The device includes a plurality of filters to separate the light at predetermined wavelengths and to recombine them at different amplitudes to generate a predetermined color hue in the visible spectrum of light.
    Type: Grant
    Filed: February 8, 1989
    Date of Patent: September 3, 1991
    Assignee: Artifex Corporation
    Inventors: Thomas F. LaDuke, Joel D. Gruber, Richard Romano