Granted Patent
Utility
US 4,719,293 · App. 06/661,876
(2,5-diisopropoxycarbonylbenzene-azo-2-hydroxy-3-carbamoyl naphthalene) pigment
Inventor:
Karl Ronco
Patented Case
View Patent ↗
Granted: Jan 12, 1988
Filed: Oct 17, 1984
Inventor
Karl Ronco
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.