Granted Patent
Utility
US 4,334,041 · App. 06/283,777
Two-phase ethylene-propylene block copolymerization process
Inventor:
Edward A. Zukowski
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Jul 16, 1981
Inventor
Edward A. Zukowski
Assignee (at issue)
El Paso Polyolefins 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.