Patents by Inventor Karl Zietan

Karl Zietan 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).

  • Color photographic multilayered material with layers of acid ashed gelatine
    Patent number: 4018609
    Abstract: In a color photographic multilayered material which is suitable for rapid processing the protective layer and the auxiliary layers contain pigskin gelatine ashed under acid condition.
    Type: Grant
    Filed: May 27, 1975
    Date of Patent: April 19, 1977
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Karl Lohmer, Hermann Seiz, Karl Zietan