Granted Patent
Utility
US 4,362,878 · App. 06/158,979
Substituted 1,2,4-triazoles as DIR compounds and their use in photographic materials
Inventor:
Terence C. Webb
Patented Case
View Patent ↗
Granted: Dec 7, 1982
Filed: Jun 12, 1980
Inventor
Terence C. Webb
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.