Granted Patent
Utility
US 4,323,682 · App. 06/088,727
Quinoxalines and their use in photographic processes
Inventors:
Gerald Jan, Remon Hagen, John Lenoir
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Oct 26, 1979
Inventors
Gerald Jan
Remon Hagen
John Lenoir
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.