Granted Patent
Utility
US 4,892,899 · App. 07/130,245
Novel compositions based on tetrachloroisoindolinone pigments
Inventors:
Edward E. Jaffe, Jost von der Crone, Bernhard Medinger
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Dec 8, 1987
Inventors
Edward E. Jaffe
Jost von der Crone
Bernhard Medinger
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.