Patents by Inventor Ernest H. Christman

Ernest H. Christman 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).

  • Method and device for enhancing visual and color perception
    Patent number: 5408278
    Abstract: Specially balanced and integrated lens pairs, one lens allowing transmission of light predominately from the shorter half of the visible spectrum (400 to 550 nm.) and the other lens allowing transmission of light predominately from the longer half of the visual spectrum (from 550 to 750 nm.), are used to subtract specific quantities of selected visible light from the ambient input into each of the two eyes. This lens pair improves visual discrimination for normal individuals and augments color perception in color-deficient individuals.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: April 18, 1995
    Inventor: Ernest H. Christman
  • Exposure-equalizing system for photographic images
    Patent number: 5353080
    Abstract: A transparent photochromic medium is placed before the film or film-equivalent of a camera or photographic imaging device such that a light exposure of the medium temporarily darkens it according to the different light values in the image. A subsequent exposure of the film is influenced by the intervening photochromic device so that the range of light is moderated, reducing over- and under-exposure of areas of the film.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: October 4, 1994
    Inventor: Ernest H. Christman