Granted Patent
Utility
US 4,764,572 · App. 06/758,182
Anionic polymerization process
Inventor:
Arthur R. Bean
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Jul 23, 1985
Inventor
Arthur R. Bean
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.