Granted Patent
Utility
US 5,155,269 · App. 07/361,714
Purification of p-aminophenol compositions and direct conversion to N-acetyl-p-aminophenol
Inventors:
Thomas J. Dunn, Vojko B. Jovanovic
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: May 24, 1989
Inventors
Thomas J. Dunn
Vojko B. Jovanovic
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.