Granted Patent
Utility
US 4,978,721 · App. 07/349,547
Functionalized elastomeric polymers
Inventor:
Pui K. Wong
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: May 9, 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.