Granted Patent
Utility
US 5,274,115 · App. 07/872,058
N'-substituted N-amino-3,4,5,6-tetrafluorophthalimides
Inventors:
Theodor Papenfuhs, Ralf Pfirmann
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Apr 23, 1992
Inventors
Theodor Papenfuhs
Ralf Pfirmann
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.