Patents by Inventor Gero Sellien

Gero Sellien 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).

  • Aperture card camera with device for spraying the exposed film
    Patent number: 4121236
    Abstract: An aperture card camera is provided with a spraying device for supplying to the exposed film a liquid such as a developer or the like. The liquid is sucked from an open supply container which is under atmospheric pressure. The liquid is then delivered to the developing chamber by a double action membrane pump. The membrane pump may comprise membranes which function as pump membranes and as valve membranes.
    Type: Grant
    Filed: June 28, 1976
    Date of Patent: October 17, 1978
    Assignee: Microbox Dr. Welp GmbH & Co.
    Inventors: Ulrich Welp, Gero Sellien