Granted Patent
Utility
US 5,281,666 · App. 07/990,913
Process for making block copolymers of vinyl aromatic hydrocarbons and/or conjugated dienes and polydimethylsiloxane
Inventor:
Ronald J. Hoxmeier
Patented Case
View Patent ↗
Granted: Jan 25, 1994
Filed: Dec 15, 1992
Inventor
Ronald J. Hoxmeier
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.