Granted Patent
Utility
US 4,307,249 · App. 06/223,195
Process for the selective preparation of p-aminophenol from nitrobenzene
Inventor:
Edward L. Derrenbacker
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Jan 7, 1981
Inventor
Edward L. Derrenbacker
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.