Granted Patent
Utility
US 5,696,296 · App. 08/534,391
Diphosphines and process for their preparation
Inventors:
Christoph Naumann, Dieter Regnat
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Sep 27, 1995
Inventors
Christoph Naumann
Dieter Regnat
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.