Granted Patent
Utility
US 5,705,674 · App. 08/698,792
Process for preparing ortho-nitrobenzonitriles
Inventors:
Thomas Wessel, Peter Koch
Patented Case
View Patent ↗
Granted: Jan 6, 1998
Filed: Aug 16, 1996
Inventors
Thomas Wessel
Peter Koch
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.