Granted Patent
Utility
US 4,789,727 · App. 07/134,647
Reduction of catalyst usage in epoxide/CO.sub.2 polymerization
Inventor:
Hsiang-Ning Sun
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Dec 18, 1987
Inventor
Hsiang-Ning Sun
Assignee (at issue)
Arco Chemical 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.