Patents by Inventor Ralf-Udo P. Forster

Ralf-Udo P. Forster 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).

  • Process for the preparation of monodisperse photographic silver halide emulsions of improved sensitivity
    Patent number: 4286055
    Abstract: The speed of monodisperse photographic emulsions made by balanced doubled jet precipitation and converted into a AgBr and/or AgBrI emulsion is increased by ripening in the presence of sulfur compounds at a pH between 8 and 9.5.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: August 25, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ralf-Udo P. Forster, Rolf H. F. Metzger