Patents by Inventor Dwight Winton Berreman

Dwight Winton Berreman 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 twist cell with grey scale capabilities
    Patent number: 4043640
    Abstract: A liquid crystal twist cell is disclosed in which the transmission characteristics may be conveniently controlled so as to produce a grey scale. The elastic constants of the crystal are maintained within a specified range to enable the convenient variation of transmission characteristics.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: August 23, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Dwight Winton Berreman
  • Liquid crystal twist cells
    Patent number: 4033671
    Abstract: An improved liquid crystal twist cell with significant reduction in the undesirable "optical bounce" and off axis interference phenomena is described.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: July 5, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Dwight Winton Berreman