Granted Patent
Utility
US 4,892,945 · App. 07/281,417
Isoindoline pigments containing at least one triazolopyrimidone radical
Inventors:
Max Jost, Kurt Burdeska, Jost von der Crone
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Dec 8, 1988
Inventors
Max Jost
Kurt Burdeska
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.