Granted Patent
Utility
US 4,701,487 · App. 06/501,473
Extrusion processing aid composition and polyolefin containing same
Inventor:
John Hakim
Patented Case
View Patent ↗
Granted: Oct 20, 1987
Filed: Jun 6, 1983
Inventor
John Hakim
Assignee (at issue)
Petrolite 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.