Granted Patent
Utility
US 4,493,532 · App. 06/442,057
Pleochroic azo dyes, a liquid crystal composition containing the azo dyes and a display device using the liquid crystal composition
Inventors:
Masaharu Kaneko, Tetsuo Ozawa, Tomio Yoneyama, Shuji Imazeki, Akio Mukoh, Mikio Sato
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Nov 16, 1982
Inventors
Masaharu Kaneko
Tetsuo Ozawa
Tomio Yoneyama
Shuji Imazeki
Akio Mukoh
Mikio Sato
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.