Granted Patent
Utility
US 4,262,120 · App. 05/892,535
Isoindoline pigments
Inventor:
Jost von der Crone
Patented Case
View Patent ↗
Granted: Apr 14, 1981
Filed: Apr 3, 1978
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.