Patents by Inventor Peter P. Crooker

Peter P. Crooker 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).

  • Color liquid crystal display consisting of polymer-dispersed chiral liquid crystal having negative dielectric anisotropy
    Patent number: 5200845
    Abstract: A color liquid crystal display and display material formed by microdroplets of chiral or cholesteric liquid crystal phase dispersed in a polymeric matrix. The liquid crystal in the microdroplets exhibits strong negative dielectric anisotropy so that in the presence of an electric field the helical planes of the chiral material align perpendicular to the field. Incident light is reflected at a selected wavelength depending upon the helical pitch. In the field-OFF state, the liquid crystal directors are configured or randomly oriented so as to scatter incident light.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: April 6, 1993
    Assignee: University of Hawaii at Manoa
    Inventors: Peter P. Crooker, Dengke Yang