Granted Patent
Utility
US 4,977,233 · App. 07/327,710
Polycarbonate capped with phenolic chain terminator mixture
Inventors:
Masaya Okamoto, Hiroshi Kurokawa
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Mar 23, 1989
Inventors
Masaya Okamoto
Hiroshi Kurokawa
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.