Granted Patent
Utility
US 5,112,936 · App. 07/465,212
Branched chain stopped polycarbonate and process for production
Inventor:
Masaya Okamoto
Patented Case
View Patent ↗
Granted: May 12, 1992
Filed: Mar 7, 1990
Inventor
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.