Granted Patent
Utility
US 5,684,182 · App. 08/604,573
Sulfonated diphosphines and a process for their preparation
Inventors:
Christoph Naumann, Ahmed M. Tafesh, Dieter Regnat, Hans-Jerg Kleiner
Patented Case
View Patent ↗
Granted: Nov 4, 1997
Filed: Feb 21, 1996
Inventors
Christoph Naumann
Ahmed M. Tafesh
Dieter Regnat
Hans-Jerg Kleiner
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.