Granted Patent
Utility
US 5,473,095 · App. 08/187,622
Process for the preparation of chlorinated 4,5-difluorobenzoic acids, -benzoic acid derivatives and -benzaldehydes
Inventors:
Ralf Pfirmann, Theodor Papenfuhs, Georg Weichselbaumer
Patented Case
View Patent ↗
Granted: Dec 5, 1995
Filed: Jan 27, 1994
Inventors
Ralf Pfirmann
Theodor Papenfuhs
Georg Weichselbaumer
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.