Granted Patent
Utility
US 5,128,294 · App. 07/341,242
Propylene polymerization catalyst and method
Inventors:
Charles K. Buehler, Cindy S. Senger, Kenneth W. Johnson
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: Apr 20, 1989
Inventors
Charles K. Buehler
Cindy S. Senger
Kenneth W. Johnson
Assignee (at issue)
Quantum Chemical 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.