Granted Patent
Utility
US 4,656,268 · App. 06/788,811
Benzoquinophthalone quaternary ammonium salt derivatives
Inventor:
Jean-Marie Adam
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Oct 18, 1985
Inventor
Jean-Marie Adam
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.