Granted Patent
Utility
US 4,990,671 · App. 07/449,240
Method for making aminophenols and their amide derivatives
Inventors:
Neil Dunski, Henry J. Buehler
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Dec 7, 1989
Inventors
Neil Dunski
Henry J. Buehler
Assignee (at issue)
MALLINCKRODT LLC
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.