Granted Patent
Utility
US 5,145,821 · App. 07/717,956
Silica supported polymerization catalyst system
Inventors:
Charles K. Buehler, Albert P. Masino
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Jun 20, 1991
Inventors
Charles K. Buehler
Albert P. Masino
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.