Granted Patent
Utility
US 5,658,526 · App. 08/551,599
Method to prepare blown films of vinyl aromatic/conjugated diolefin block copolymer
Inventors:
Amit Rastogi, Bing Yang
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Nov 1, 1995
Inventors
Amit Rastogi
Bing Yang
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.