Granted Patent
Utility
US 4,233,399 · App. 06/037,071
Photographic elements containing amino-substituted hydroxy-pyridones
Inventors:
Rainer Kitzing, John G. V. Scott, Terence C. Webb, Graham Evans
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: May 8, 1979
Inventors
Rainer Kitzing
John G. V. Scott
Terence C. Webb
Graham Evans
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.