Granted Patent
Utility
US 5,550,237 · App. 08/415,696
Process for the preparation of carboxyarenesulfonic acids and their carboxylic acid derivatives
Inventor:
Jan Vermehren
Patented Case
View Patent ↗
Granted: Aug 27, 1996
Filed: Apr 3, 1995
Inventor
Jan Vermehren
Assignee (at issue)
Hoechst Schering Agrevo 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.