Granted Patent
Utility
US 4,384,119 · App. 06/340,671
Catalytically reductive ring closure for 1-acylamino-3,4-phthaloylacridones
Inventor:
Maurice Grelat
Patented Case
View Patent ↗
Granted: May 17, 1983
Filed: Jan 19, 1982
Inventor
Maurice Grelat
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.