Granted Patent
Utility
US 4,323,519 · App. 06/029,044
Method of washing organic solvent solution of polycarbonate
Inventors:
Hazime Mori, Katsuhisa Kohyama, Katsuhiko Nakamura, Shinichi Takamatsu
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Apr 11, 1979
Inventors
Hazime Mori
Katsuhisa Kohyama
Katsuhiko Nakamura
Shinichi Takamatsu
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.