Granted Patent
Utility
US 5,614,014 · App. 08/384,323
Process for the preparation of Quinacridone pigments
Inventor:
Manfred Urban
Patented Case
View Patent ↗
Granted: Mar 25, 1997
Filed: Feb 1, 1995
Inventor
Manfred Urban
Assignee (at issue)
Hoechst GmbH
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.