Granted Patent
Utility
US 5,322,639 · App. 08/045,787
Carboxylic acid ester compound, liquid crystal material, liquid crystal composition and liquid crystal element
Inventors:
Junichi Kawabata, Hideo Yamaoka, Yuuichirou Tatsuki, Shinichi Nishiyama
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: Apr 14, 1993
Inventors
Junichi Kawabata
Hideo Yamaoka
Yuuichirou Tatsuki
Shinichi Nishiyama
Assignee (at issue)
Mitsui Petrochemical 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.