Patents by Inventor Joseph A. Sincius

Joseph A. Sincius 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).

  • High contrast continuous tone developer and process of use
    Patent number: 4172728
    Abstract: A photographic developer containing hydroquinone, an auxiliary developer such as phenidone, and high sulfite is formulated using an organic base such as diethanolamine. This is useful for processing litho film in rapid access machine processors to produce high contrast line and half-tone dot images from films processed therein.
    Type: Grant
    Filed: December 16, 1977
    Date of Patent: October 30, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Joseph A. Sincius, William R. Pangratz