Patents by Inventor Brad W. Dreisbach

Brad W. Dreisbach 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).

  • Patent number: 5121131
    Abstract: A system and method of creating transmissive images in a developed photographic film is disclosed. A light-sensitive silver halide emulsion is developed to form an opaque surface layer of fine silver grains with a clear underlayer supported on a transparent substrate. Transmissive images are created in the opaque surface layer by selectively applying an oxidizing solution which oxidizes the silver grains to silver ions which are poor absorbers of light. The underlayer absorbs excess oxidizing solution with little or no swelling. The oxidizing solution may be dispersed by a modified ink-jet printer. The imaged film has high contrast and can be directly used without further processing in color printing plate making systems and other applications requiring a transmissive film or mask.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: June 9, 1992
    Assignee: Drexler Technology Corporation
    Inventors: Eric W. Bouldin, Brad W. Dreisbach