Granted Patent
Utility
US 5,227,535 · App. 07/957,674
Process for the preparation of 2-nitro-5-fluoro- or -5-chlorophenol
Inventors:
Ralf Pfirmann, Theodor Papenfuhs, Klaus Forstinger
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Oct 7, 1992
Inventors
Ralf Pfirmann
Theodor Papenfuhs
Klaus Forstinger
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.