Granted Patent
Utility
US 4,882,384 · App. 07/150,579
Modified block copolymers
Inventors:
Carl L. Willis, Steven S. Chin
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Feb 1, 1988
Inventors
Carl L. Willis
Steven S. Chin
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.