Granted Patent
Utility
US 4,415,753 · App. 06/343,993
Process for preparing p-aminophenol and alkyl substituted p-aminophenol
Inventors:
Douglas C. Caskey, Douglas W. Chapman
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Jan 29, 1982
Inventors
Douglas C. Caskey
Douglas W. Chapman
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.