Granted Patent
Utility
US 4,743,641 · App. 07/002,171
Polycarbonate resin composition
Inventors:
Tatsuji Shizawa, Naoki Nonagase, Kenji Ozawa
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Jan 12, 1987
Inventors
Tatsuji Shizawa
Naoki Nonagase
Kenji Ozawa
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.