Patents Assigned to B Optical
  • Fresnel lens projection system with high gain screen
    Patent number: 4457594
    Abstract: A projection lens system of the type used in connection with cathode ray tubes, and more specifically a cathode ray tube projection system having an internal lens folding means, useful in projecting an image or series of images on a screen.
    Type: Grant
    Filed: February 18, 1982
    Date of Patent: July 3, 1984
    Assignee: B Optical
    Inventor: Marvin P. Hodges
  • Fresnel lens system
    Patent number: 4398810
    Abstract: A projection lens system of the type used in connection with cathode ray tubes, and more specifically a cathode ray tube projection system having an internal lens folding means, useful in projecting an image or series of images on a screen.
    Type: Grant
    Filed: February 18, 1982
    Date of Patent: August 16, 1983
    Assignee: B Optical
    Inventors: Marvin P. Hodges, Richard A. Buchroeder