Granted Patent
Utility
US 5,847,143 · App. 08/715,058
Process for preparing quinacridones
Inventor:
James B. Ganci
Patented Case
View Patent ↗
Granted: Dec 8, 1998
Filed: Sep 17, 1996
Inventor
James B. Ganci
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.