Patents by Inventor Mark Troll

Mark Troll 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).

  • Holograms
    Patent number: 4970129
    Abstract: Volume phase holograms and other holographic elements are disclosed which include microscopic areas of a material having an index of refraction different from that of the holographic fringes.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: November 13, 1990
    Assignee: Polaroid Corporation
    Inventors: Richard T. Ingwall, Mark A. Troll