Granted Patent
Utility
US 4,657,982 · App. 06/565,774
Blends of polyethylene and polybutenes
Inventors:
Alan Keith Breck, Alistair N. Mollison
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Dec 27, 1983
Inventors
Alan Keith Breck
Alistair N. Mollison
Assignee (at issue)
DuPont Canada Inc.
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.