Granted Patent
Utility
US 4,238,353 · App. 06/046,985
Olefin polymerization catalyst
Inventor:
Anthony N. Speca
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jun 8, 1979
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.