Granted Patent
Utility
US 4,977,014 · App. 07/397,072
Thermoplastic block copolymer films
Inventors:
Neil F. Mitchell, Lie K. Djiauw
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Aug 22, 1989
Inventors
Neil F. Mitchell
Lie K. Djiauw
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.