Granted Patent
Utility
US 5,470,939 · App. 08/322,794
Polycarbonate copolymer
Inventor:
Mitsugu Nakae
Patented Case
View Patent ↗
Granted: Nov 28, 1995
Filed: Oct 13, 1994
Inventor
Mitsugu Nakae
Assignee (at issue)
Idemitsu Petrochemical Co., Ltd.
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.