Granted Patent
Utility
US 5,221,650 · App. 07/854,199
Supported high activity polypropylene catalyst component with regular distribution of magnesium values provided utilizing a controlled drying protocol
Inventor:
Charles K. Buehler
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Mar 20, 1992
Inventor
Charles K. Buehler
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.