Patents by Inventor Hendrick J. Gerritsen

Hendrick J. Gerritsen 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).

  • Quasi volume diffracting structures
    Patent number: 5048925
    Abstract: A structure for responding to incident radiation for directing said radiation in a selected direction with respect to the structure, the structure using at least two outer diffraction elements and an intermediate diffraction element, the diffraction characteristics being selected so that the selected direction remains within relatively limited confines independent of the angles of incidence of the incoming radiation over a selected range thereof.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: September 17, 1991
    Assignee: Advanced Environmental Research Group
    Inventors: Hendrick J. Gerritsen, Richard Ian, Elisabeth W. King, Donald K. Thornton, Sally N. Weber