Patents by Inventor Dieter Himmelreich

Dieter Himmelreich 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 recording material with continuous tone gradation suitable for processing in daylight
    Patent number: 5045444
    Abstract: Black-and-white continuous tone reproductions may be obtained under daylight conditions with a photographic recording material in which the silver halide consists to an extent of at least 75 mol % of silver chloride and has been prepared in the presence of a 1-phenyl-5-mercaptotetrazole compound. The material is particularly suitable for reprophotographic work, e.g. for the production of continuously graduated masks.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: September 3, 1991
    Assignee: Agfa Gevaert Aktiengesellschaft
    Inventors: Wilfried Bahnmuller, Jutta Finkener, Dieter Himmelreich, Wolfgang Reiber, Heinz Schwarz