Granted Patent
Utility
US 4,839,458 · App. 07/063,001
Preparation with controlled amounts of polycarbonate carbon tetrachloride
Inventors:
Shinichiro Koga, Akira Matsuno, Katsuyuki Sakata, Yoshiaki Ohtani, Isao Akihara
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Jun 17, 1987
Inventors
Shinichiro Koga
Akira Matsuno
Katsuyuki Sakata
Yoshiaki Ohtani
Isao Akihara
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.