Granted Patent
Utility
US 5,488,152 · App. 08/386,292
Process for the preparation of 4-alkoxy-3,5,6-trifluoro-phthalic acids and 3-alkoxy-2,4,5-trifluorobenzoic acids
Inventors:
Ralf Pfirmann, Theodor Papenfuhs
Patented Case
View Patent ↗
Granted: Jan 30, 1996
Filed: Feb 9, 1995
Inventors
Ralf Pfirmann
Theodor Papenfuhs
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.