Granted Patent
Utility
US 4,576,885 · App. 06/571,018
Photographic material for the silver dye bleach process
Inventors:
Mario Fryberg, Heinrich Schaller, Rolf Steiger, Heinz Peter
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Jan 16, 1984
Inventors
Mario Fryberg
Heinrich Schaller
Rolf Steiger
Heinz Peter
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.