Patents by Inventor Michael W. Andreasen

Michael W. Andreasen 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 filter assembly for enhancement of image contrast and glare reduction of cathode ray display tube
    Patent number: 4846551
    Abstract: An optical interference filter structure incorporates antireflectance and light absorbing elements disposed on a substrate. The filter structure is shaped to conform substantially to the face of a cathode ray tube or other luminous display, such as a cathode ray tube for example. The materials of the elements are selected for their characteristics including indices of refraction, light absorption and chromatic filtering so that in combination they provide optimum antireflectance, antiglare and image contrast features.
    Type: Grant
    Filed: April 11, 1988
    Date of Patent: July 11, 1989
    Assignee: Optical Coating Laboratory, Inc.
    Inventors: James D. Rancourt, John S. Matteucci, Michael W. Andreasen