Granted Patent
Utility
US 4,661,555 · App. 06/802,448
Polycarbonate resin composition and process for its production
Inventors:
Shinichiro Koga, Katsuhisa Kohyama, Katsuyuki Sakata
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Nov 27, 1985
Inventors
Shinichiro Koga
Katsuhisa Kohyama
Katsuyuki Sakata
Assignee (at issue)
Mitsubishi Chemical Industries, 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.