Granted Patent
Utility
US 4,284,739 · App. 06/064,961
Block copolymerization process
Inventor:
Edward A. Zukowski
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Jul 27, 1979
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.