Granted Patent
Utility
US 5,382,465 · App. 08/062,227
Anthraquinonic colorant and polarizing film containing the colorant
Inventors:
Tsutami Misawa, Hisato Itoh, Tsutomu Nishizawa, Masami Nakano, Hiroyuki Katayama
Patented Case
View Patent ↗
Granted: Jan 17, 1995
Filed: May 18, 1993
Inventors
Tsutami Misawa
Hisato Itoh
Tsutomu Nishizawa
Masami Nakano
Hiroyuki Katayama
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.