Granted Patent
Utility
US 6,489,513 · App. 10/010,176
Process for the preparation of enantiomerically pure (5, 5′-dichloro-6,6′-dimethoxy-biphenyl-2,2′-diyl)- bis(diphenylphosphine oxides)
Inventors:
Torsten Pohl, Thomas Prinz, Guido Giffels, Wolfram Sirges
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Nov 13, 2001
Inventors
Torsten Pohl
Thomas Prinz
Guido Giffels
Wolfram Sirges
Assignee (at issue)
Bayer Aktiengesellschaft
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.