Granted Patent
Utility
US 5,492,875 · App. 08/277,480
Catalyst for nucleophilic aromatic substitutions
Inventors:
Thomas Schach, Theodor Papenfuhs
Patented Case
View Patent ↗
Granted: Feb 20, 1996
Filed: Jul 19, 1994
Inventors
Thomas Schach
Theodor Papenfuhs
Assignee (at issue)
Hoechst GmbH
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.