Granted Patent
Utility
US 4,479,885 · App. 06/469,661
Phthalonitrile derivatives and a liquid crystal composition containing the same
Inventors:
Akio Mukoh, Teruo Kitamura, Masaharu Kaneko, Tetsuo Ozawa
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Feb 25, 1983
Inventors
Akio Mukoh
Teruo Kitamura
Masaharu Kaneko
Tetsuo Ozawa
Assignees (at issue)
HITACHI, LTD.
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.