Granted Patent
Utility
US 4,968,754 · App. 07/386,161
Functionalized block copolymers
Inventor:
Pui K. Wong
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Jul 28, 1989
Inventor
Pui K. Wong
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.