Granted Patent
Utility
US 5,221,769 · App. 07/634,999
Production of p-acetylaminophenol from p-aminophenyl acetate
Inventors:
Hideyuki Akieda, Naoki Sato, Ryuichi Mita, Mitsumasa Umemoto
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Dec 27, 1990
Inventors
Hideyuki Akieda
Naoki Sato
Ryuichi Mita
Mitsumasa Umemoto
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.