Granted Patent
Utility
US 4,374,227 · App. 06/263,887
Extruded gloss improvement in pipe blends with low pressure low density polyethylene
Inventor:
William J. Michie, Jr.
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: May 15, 1981
Inventor
William J. Michie, Jr.
Assignee (at issue)
Union Carbide 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.