Patents by Inventor Bruce B. Cunningham

Bruce B. Cunningham 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).

  • Vacuum contact reproduction apparatus
    Patent number: 4190360
    Abstract: A contact reproduction apparatus for duplicating images formed upon a transparency onto a photosensitive material, including plural vacuum contact printers, the respective evacuation chambers of which are connected, in parallel manner, to a master vacuum holding tank, the interior of which is maintained at an extremely high state of evacuation by a high displacement vacuum pump capable of drawing a maximum end vacuum in excess of 29 inches of mercury. An extremely high evacuation potential is provided at each evacuation chamber by making the volume of the master holding tank significantly larger than the combined volumes of the respective evacuation chambers.
    Type: Grant
    Filed: February 16, 1979
    Date of Patent: February 26, 1980
    Assignee: Lanman Lithotech, Inc.
    Inventors: Bruce B. Cunningham, Charles R. Barfield, Jr.