Granted Patent
Utility
US 5,451,699 · App. 08/223,635
Process for the preparation of crystalline, salt-free, chlorine-substituted 3-nitrobenzenesulfonic acid hydrates
Inventor:
Otto Arndt
Patented Case
View Patent ↗
Granted: Sep 19, 1995
Filed: Apr 6, 1994
Inventor
Otto Arndt
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.