Granted Patent
Utility
US 4,067,739 · App. 05/601,965
Method of preparing a monosize silver halide emulsion involving Ostwald ripening followed by a crystal growth stage
Inventor:
John D. Lewis
Patented Case
View Patent ↗
Granted: Jan 10, 1978
Filed: Aug 4, 1975
Inventor
John D. Lewis
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.