Granted Patent
Utility
US 4,252,939 · App. 06/047,796
Method for manufacture of aromatic polyester-polycarbonate
Inventors:
Hajime Mori, Katsuhisa Kohyama, Katsuhiko Nakamura, Katsuyuki Sakata
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Jun 12, 1979
Inventors
Hajime Mori
Katsuhisa Kohyama
Katsuhiko Nakamura
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.