Patents Represented by Attorney John Morrow

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  • Zoom projection lens
    Patent number: 3972592
    Abstract: A zoom projection lens having six elements with a second biconcave negative element being movable for zooming. Five of the six elements are made of plastic materials and the use of aspheres on two surfaces, including one surface of the movable element, is disclosed to achieve good optical performance at a relative aperture of at least f/1.57.
    Type: Grant
    Filed: October 18, 1974
    Date of Patent: August 3, 1976
    Assignee: Eastman Kodak Company
    Inventor: Paul Lewis Ruben