Granted Patent
Utility
US 4,361,685 · App. 06/269,222
Polymerization of olefins in the presence of catalyst prepared from organo zirconium-chromium mixtures
Inventor:
Randall S. Shipley
Patented Case
View Patent ↗
Granted: Nov 30, 1982
Filed: Jun 1, 1981
Inventor
Randall S. Shipley
Assignee (at issue)
THE DOW CHEMICAL COMPANY
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.