Patents by Inventor Ernest H. Lehmann

Ernest H. Lehmann 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).

  • Two color xeroradiography development
    Patent number: 4039831
    Abstract: A xeroradiographic system employing both fringe field and absolute development in order to provide both enhancement of sharply changing boundaries as well as imaging slowly changing borders is provided. This is accomplished by first developing the image with a colored toner in the fringe field i.e. far spaced electroded mode and then developing the electrostatic image in the absolute mode i.e. employing a closely spaced electrode to the latent electrostatic image with a contrasting colored toner.
    Type: Grant
    Filed: October 15, 1975
    Date of Patent: August 2, 1977
    Assignee: Xerox Corporation
    Inventor: Ernest H. Lehmann