Granted Patent
Utility
US 5,618,868 · App. 08/223,740
Polarizing film of a hydrophilic polymer film containing a novel azo compound
Inventors:
Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
Patented Case
View Patent ↗
Granted: Apr 8, 1997
Filed: Apr 6, 1994
Inventors
Tsutami Misawa
Akira Ogiso
Rihoko Imai
Hisato Itoh
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.