Granted Patent
Utility
US 5,952,477 · App. 08/951,159
Azo compound and polarizing film
Inventors:
Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
Patented Case
View Patent ↗
Granted: Sep 14, 1999
Filed: Oct 15, 1997
Inventors
Tsutami Misawa
Akira Ogiso
Rihoko Imai
Hisato Itoh
Assignee (at issue)
MITSUI CHEMICALS, INC.
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.