Granted Patent
Utility
US 4,687,815 · App. 06/812,424
Hydrogenated block copolymers
Inventor:
Pui K. Wong
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Dec 23, 1985
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.