Granted Patent
Utility
US 4,297,461 · App. 06/141,095
Olefin polymerization catalyst
Inventor:
Anthony N. Speca
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Apr 17, 1980
Inventor
Anthony N. Speca
Assignee (at issue)
National Petro Chemicals 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.