Granted Patent
Utility
US 5,807,961 · App. 08/860,013
Polyamic acid, polyimide film and liquid crystal aligning film and liquid crystal display element using the formers
Inventors:
Toshiya Sawai, Masaaki Yazawa, Seiji Oikawa, Shizuo Murata, Masaharu Hayakawa, Etsuo Nakagawa
Patented Case
View Patent ↗
Granted: Sep 15, 1998
Filed: Jun 20, 1997
Inventors
Toshiya Sawai
Masaaki Yazawa
Seiji Oikawa
Shizuo Murata
Masaharu Hayakawa
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.