Patents by Inventor Ronald Norman Friel

Ronald Norman Friel 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 devices having diode characteristics
    Patent number: 4042293
    Abstract: The device comprises an enclosure including two spaced apart electrodes for applying an electric field through a film of liquid crystal material between the electrodes. Disposed on one of the electrodes, between it and the liquid crystal film, is a semiconductor material layer. The semiconductor layer has a rectifying or non-ohmic contact with the liquid crystal film, and has an ohmic or low resistance contact with the electrode. The layer has a resistance, when the rectifying contact is reverse biased, greater than that of the liquid crystal film, and, when the rectifying contact is forward biased, less than that of the film.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: August 16, 1977
    Assignee: RCA Corporation
    Inventors: Joseph John Hanak, Ronald Norman Friel, Lawrence Alan Goodman