Granted Patent
Utility
US 4,764,217 · App. 07/129,577
Novel compositions based on isoindoline pigments
Inventors:
Jost von der Crone, Bernhard Medinger, Philippe Bugnon
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Dec 7, 1987
Inventors
Jost von der Crone
Bernhard Medinger
Philippe Bugnon
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.