Granted Patent
Utility
US 5,658,840 · App. 08/457,280
Preparation of Ziegler-Natta type catalyst systems
Inventors:
Peter Kölle, Patrik Müller, Rainer Hemmerich, Erich Kolk
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Jun 5, 1995
Inventors
Peter Kölle
Patrik Müller
Rainer Hemmerich
Erich Kolk
Assignee (at issue)
BASF SE
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.