Granted Patent
Utility
US 4,248,983 · App. 06/008,994
Clear impact resistant thermoplastic star-block copolymers
Inventors:
Le-Khac Bi, Ralph Milkovich, Kenneth W. Doak
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Feb 5, 1979
Inventors
Le-Khac Bi
Ralph Milkovich
Kenneth W. Doak
Assignee (at issue)
Arco Polymers, Inc.
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.