Granted Patent
Utility
US 4,473,661 · App. 06/394,068
Polymerization catalyst system containing organolithium, dialkyl magnesium and/or trialkyl aluminum, and a phosphine oxide
Inventor:
James E. Hall
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Jul 1, 1982
Inventor
James E. Hall
Assignee (at issue)
The Firestone Tire & Rubber 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.