Granted Patent
Utility
US 4,193,801 · App. 05/965,965
Process for producing photographic silver halide material
Inventors:
Howard R. Hopwood, Roy Trunley
Patented Case
View Patent ↗
Granted: Mar 18, 1980
Filed: Dec 4, 1978
Inventors
Howard R. Hopwood
Roy Trunley
Assignee (at issue)
Ciba-Geigy
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.