Granted Patent
Utility
US 5,423,100 · App. 08/095,839
Water-soluble azo compounds and polarizing films using the compounds
Inventors:
Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Jul 23, 1993
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.