Granted Patent
Utility
US 5,166,346 · App. 07/630,434
Process for the preparation of thiophene derivatives and also new dihydrothiophene 1-oxides
Inventors:
Robert Rippel, Hans-Wolfram Flemming, Manfred Rukwied
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Dec 20, 1990
Inventors
Robert Rippel
Hans-Wolfram Flemming
Manfred Rukwied
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.