Granted Patent
Utility
US 4,849,481 · App. 07/071,845
Star shaped asymmetric block copolymer of monoalkenyl aromatic hydrocarbon and conjugated diene
Inventors:
Robert B. Rhodes, Arthur R. Bean
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Jul 10, 1987
Inventors
Robert B. Rhodes
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.