Granted Patent
Utility
US 4,968,653 · App. 07/374,660
Propylene polymerization catalyst
Inventors:
Craig C. Meverden, Thomas J. Pullukat
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Jun 30, 1989
Inventors
Craig C. Meverden
Thomas J. Pullukat
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.