Patents by Inventor Wilhelm J. Erdmann

Wilhelm J. Erdmann 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).

  • Photographic element and method
    Patent number: 6100005
    Abstract: There is described a novel diffusion transfer photographic system wherein an exposed diffusion transfer photographic film unit is developed with an aqueous alkaline processing composition in the presence of alumina-free titanium dioxide.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: August 8, 2000
    Assignee: Polaroid Corporation
    Inventors: Daniel J. Churella, Wilhelm J. Erdmann, Gerard Gomes, John R. Linton, Francis M. Pierce