Granted Patent
Utility
US 4,826,920 · App. 07/134,640
Films of linear ethylene polymer, polystyrene, and high impact polystyrene
Inventor:
David V. Dobreski
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Dec 18, 1987
Inventor
David V. Dobreski
Assignee (at issue)
Mobil Oil 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.