Granted Patent
Utility
US 5,451,632 · App. 08/131,144
Polycarbonate-polyorganosiloxane copolymer and a resin composition
Inventors:
Ryozo Okumura, Masaya Okamoto
Patented Case
View Patent ↗
Granted: Sep 19, 1995
Filed: Oct 4, 1993
Inventors
Ryozo Okumura
Masaya Okamoto
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.