Granted Patent
Utility
US 4,970,310 · App. 07/395,243
Isoindoline pigment compounds
Inventor:
Jost von der Crone
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Aug 17, 1989
Inventor
Jost von der Crone
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.