Granted Patent
Utility
US 5,142,018 · App. 07/784,718
Process for preparing polycarbonates
Inventors:
Takeshi Sakashita, Tomoaki Shimoda
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Oct 30, 1991
Inventors
Takeshi Sakashita
Tomoaki Shimoda
Assignee (at issue)
GE Plastics Japan 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.