Granted Patent
Utility
US 4,398,916 · App. 06/315,866
Process for purification of quinoline yellow
Inventors:
Nicholas A. Ambrosiano, James E. Kassner
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Oct 28, 1981
Inventors
Nicholas A. Ambrosiano
James E. Kassner
Assignee (at issue)
Sterling Drug, Inc.
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.