Patents by Inventor Irwin Friedman

Irwin Friedman 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).

  • Single mirror projection optical system
    Patent number: 4779966
    Abstract: A well corrected ring field catadioptric optical system utilizing refractive elements of the same glass type. A virtual relay corrected for axial and lateral primary color incorporates an air-surface doublet and two field lenses to correct for field aberrations to provide a well corrected ring field virtual image. A spherical mirror is used to make the virtual image accessible.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: October 25, 1988
    Assignee: The Perkin-Elmer Corporation
    Inventor: Irwin Friedman
  • Wide angle lens with improved flat field characteristics
    Patent number: 4772107
    Abstract: There is disclosed an improvement in wide angle lenses wherein very flat field characteristics are achieved. This is accomplished by a novel two element field flattener just before the image plane. One of the elements is positive and the other negative. It is possible to thereby correct both third and fifth order Petzval curvature, as well as third and fifth order distortion.
    Type: Grant
    Filed: November 5, 1986
    Date of Patent: September 20, 1988
    Assignee: The Perkin-Elmer Corporation
    Inventor: Irwin Friedman