Granted Patent
Utility
US 4,180,530 · App. 06/009,708
Clear impact resistant thermoplastic star-block copolymers
Inventors:
Le-Khac Bi, Ralph Milkovich
Patented Case
View Patent ↗
Granted: Dec 25, 1979
Filed: Feb 5, 1979
Inventors
Le-Khac Bi
Ralph Milkovich
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.