Granted Patent
Utility
US 5,446,135 · App. 08/212,747
Sulfonyloxy substituted tris-azoaryl dyes and copper complex salts thereof and polarizing films dyed therewith
Inventors:
Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
Patented Case
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Granted: Aug 29, 1995
Filed: Mar 14, 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.