Granted Patent
Utility
US 5,155,274 · App. 07/822,943
Complex compounds containing sulfonated phenyl phosphanes
Inventors:
Wolfgang Anton Herrmann, Jurgen Kulpe, Jürgen Kellner, Herbert Riepl
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Jan 21, 1992
Inventors
Wolfgang Anton Herrmann
Jurgen Kulpe
Jürgen Kellner
Herbert Riepl
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.