Granted Patent
Utility
US 4,480,075 · App. 06/507,382
Block copolymers of Ziegler-Natta polymerized and anionically polymerized monomers
Inventor:
Carl L. Willis
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Jun 24, 1983
Inventor
Carl L. Willis
Assignee (at issue)
SHELL OIL 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.