Granted Patent
Utility
US 6,043,398 · App. 08/634,533
Chemical processes using aryl diphosphine containing catalysts
Inventors:
Christian Kohlpaintner, Brian E. Hanson, Hao Ding
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Apr 18, 1996
Inventors
Christian Kohlpaintner
Brian E. Hanson
Hao Ding
Assignees (at issue)
Celanese International Corporation
Virginia Poly-technic Inc.
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.