Patents by Inventor Roman S. Dabrowski

Roman S. Dabrowski 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).

  • Liquid crystal device and a liquid crystal material
    Patent number: 6919950
    Abstract: The invention relates to a liquid crystal device, comprising an antiferroelectric liquid crystal material (AFLC material) having smectic layers, and two substrates confining the AFLC material therebetween, wherein the AFLC material is uniaxial negative. Preferably, the AFLC material is uniaxial as a consequence of a surface stabilization and of a selected smectic tilt angle ? of the AFLC material. Preferably, the angle ? is in the range of 40°???50°, especially 45°. The invention also relates to electrooptic liquid crystal devices.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: July 19, 2005
    Inventors: Roman S. Dabrowski, Witold J. Drzewinski, Herman Pauwels, Anders Dahlgren, Sven T. Lagerwall, Per Rudquist, Koen D'Have, Marek Matuszcyk, Pontus Jagemalm
  • Liquid crystal device and a liquid crystal material
    Publication number: 20020075445
    Abstract: The invention relates to a liquid crystal device, comprising an antiferroelectric liquid crystal material (AFLC material) having smectic layers, and two substrates confining said AFLC material therebetween, wherein said AFLC material is uniaxial negative. Preferably, the AFLC material is uniaxial as a consequence of a surface stabilization and of a selected smectic tilt angle &thgr; of said AFLC material. Preferably, said angle &thgr; is in the range of 40°<&thgr;<50°, especially 45°. The invention also relates to electrooptic liquid crystal devices.
    Type: Application
    Filed: August 28, 2001
    Publication date: June 20, 2002
    Inventors: Roman S. Dabrowski, Witold J. Drzewinski, Herman Pauwels, Anders Dahlgren, Sven T. Lagerwall, Per Rudquist, Koen D'Have, Marek Matuszcyk, Pontus Jagemalm