Granted Patent
Utility
US 5,637,764 · App. 08/561,922
Process for the preparation of brominated or chlorinated aromatic carboxylic acids
Inventors:
Freimund Rohrscheid, Georg Grotsch
Patented Case
View Patent ↗
Granted: Jun 10, 1997
Filed: Nov 22, 1995
Inventors
Freimund Rohrscheid
Georg Grotsch
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.