Granted Patent
Utility
US 4,294,916 · App. 06/145,174
Photographic silver halide material containing a dye filter or a dye anti-halation layer
Inventors:
Stephen Postle, Alexander F. Psaila
Patented Case
View Patent ↗
Granted: Oct 13, 1981
Filed: Apr 30, 1980
Inventors
Stephen Postle
Alexander F. Psaila
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.