Granted Patent
Utility
US 5,648,535 · App. 08/451,338
Process for preparing acyl aminophenols
Inventors:
James A. Foster, Werner H. Mueller, Debra A. Ryan, Hartmut Wiezer
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: May 26, 1995
Inventors
James A. Foster
Werner H. Mueller
Debra A. Ryan
Hartmut Wiezer
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.