Granted Patent
Utility
US 4,954,652 · App. 07/217,652
Production of acetaminophen
Inventors:
John R. Fritch, Olan S. Fruchey, Theodore Horlenko
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Jul 12, 1988
Inventors
John R. Fritch
Olan S. Fruchey
Theodore Horlenko
Assignee (at issue)
Hoechst Celanese Corporation
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.