Patents by Inventor Herbert Blank

Herbert Blank 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 speed lithographic film element
    Patent number: 4230796
    Abstract: High speed litho film in which short-life development accelerators such as cysteine methyl ester and its analogues are incorporated into the silver halide emulsion layer.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: October 28, 1980
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Herbert Gunther, Herbert Blank