Patents by Inventor Christopher J. J. Walker

Christopher J. J. Walker 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).

  • Laser addressed smectic displays
    Patent number: 4701029
    Abstract: A laser beam addressed smectic display in which the laser beam is used to write clear tracks in an optically scattering field employs an anisotropic conductivity dopant in the liquid crystal filling so that the cell can be electrically set into the scattering state by means of dynamic scattering effects. This requires the use of a laser light absorbing dye that is not only photochemically stable, but also stable against the effects of the relatively high fields and currents present when the cell is being set into the scattering state.
    Type: Grant
    Filed: July 10, 1985
    Date of Patent: October 20, 1987
    Assignee: Standard Telephones and Cables Public Limited Company
    Inventors: William A. Crossland, Christopher J. J. Walker, Anthony B. Davey