Granted Patent
Utility
US 5,502,192 · App. 08/287,348
Process for the preparation of quinacridones from dihydroquinacridones in an aqueous medium
Inventor:
James B. Ganci
Patented Case
View Patent ↗
Granted: Mar 26, 1996
Filed: Aug 8, 1994
Inventor
James B. Ganci
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.