Patents by Inventor James B. Grimbleby

James B. Grimbleby 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).

  • Automatic focusing device with frequency weighted amplification
    Patent number: 4510384
    Abstract: An optical system is automatically focussed by deriving an electrical signal which has a frequency distribution corresponding to the spatial frequency distribution of an image received from a focussing lens; applying to the electrical signal an amplification which is greater at high frequencies than at low frequencies; and adjusting the optical system to maximize the amplified signal.
    Type: Grant
    Filed: August 16, 1982
    Date of Patent: April 9, 1985
    Assignee: National Research Development Corporation
    Inventors: James B. Grimbleby, Christopher G. Talbot