Patents by Inventor Michael Krumrey

Michael Krumrey 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).

  • Patent number: 4767194
    Abstract: An optical system contains a liquid crystal cell (1), to the liquid crystal layer (11) of which an E-field can be applied transversely to the plane of the layer. A light source (3) sends to the liquid crystal cell (1) a beam of rays parallel to the field direction. The liquid crystal is in the form of a chiral, optically isotropic phase ("blue phase"). This phase has a field-dependent optical density for the incident light and is matched to the light wavelength such that no selective reflection takes place. Such a cell is also optically isotropic in the presence of an E-field, switches rapidly and requires no interface orientation. Its preferred fields of use are: intensity modulation of light of a given wavelength, or as a phase grid in a schlieren-optical system, an etalon in a laser, or a light switch.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: August 30, 1988
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Gerd Heppke, Feodor Oestreicher, Heinz-Siegfried Kitzerow, Michael Krumrey