Granted Patent
Utility
US 4,335,199 · App. 06/122,502
High contrast by imagewise iodide infection in a mixed silver halide system
Inventors:
Daniel J. Mickewich, John R. Shock, Daniel F. Juers
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Feb 19, 1980
Inventors
Daniel J. Mickewich
John R. Shock
Daniel F. Juers
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.