Granted Patent
Utility
US 4,980,422 · App. 07/569,680
Hydroesterification of polymerized conjugated dienes
Inventor:
Carl L. Willis
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Aug 20, 1990
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.