Patents by Inventor Ralph M. Darr

Ralph M. Darr 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 of producing a colored film from a black-and-white picture
    Patent number: 3941463
    Abstract: The method of producing a colored film from an exposed black-and-white picture and especially from an exposed black-and-white motion picture film wherein a black-and-white image is projected onto a surface, opaque pastel colors are applied within selected areas of the projected image and the reflected colored composite, of the opaque pastel colors and the black-and-white image superimposed thereon, is then photographed with color-sensitive film.
    Type: Grant
    Filed: August 26, 1968
    Date of Patent: March 2, 1976
    Assignee: Deloy J. White
    Inventors: Wilfred W. Wetzel, Ralph M. Darr