Granted Patent
Utility
US 6,174,458 · App. 09/242,921
Tetracyclic compound having lateral halogen substituent and liquid crystal composition comprising the same
Inventors:
Koji Koga, Tsugumichi Ando, Hiroyuki Takeuchi, Shuichi Matsui, Kazutoshi Miyazawa, Norihisa Hachiya, Etsuo Nakagawa
Patented Case
View Patent ↗
Granted: Jan 16, 2001
Filed: Feb 26, 1999
Inventors
Koji Koga
Tsugumichi Ando
Hiroyuki Takeuchi
Shuichi Matsui
Kazutoshi Miyazawa
Norihisa Hachiya
Etsuo Nakagawa
Assignee (at issue)
Chisso Corporation
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.