Granted Patent
Utility
US 4,970,023 · App. 07/350,700
Biphenyl compounds, method of producing the same as well as liquid crystal compositions and light switch elements each containing the same
Inventors:
Toshihiro Hirai, Atsushi Yoshizawa, Isa Nishiyama, Mitsuo Fukumasa, Nobuyuki Shiratori, Akihisa Yokoyama
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: May 9, 1989
Inventors
Toshihiro Hirai
Atsushi Yoshizawa
Isa Nishiyama
Mitsuo Fukumasa
Nobuyuki Shiratori
Akihisa Yokoyama
Assignee (at issue)
Nippon Mining Company Limited
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.