Granted Patent
Utility
US 5,777,087 · App. 08/634,487
Aryl diphosphines and catalysts containing the same
Inventors:
Christian Kohlpaintner, Brian E. Hanson, Hao Ding
Patented Case
View Patent ↗
Granted: Jul 7, 1998
Filed: Apr 18, 1996
Inventors
Christian Kohlpaintner
Brian E. Hanson
Hao Ding
Assignee (at issue)
Celanese International Corporation
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.