Granted Patent
Utility
US 4,842,781 · App. 07/141,839
Colored polarizing film and method of making same
Inventors:
Tsutomu Nishizawa, Yasuyuki Yamada, Junichi Fujio, Shin Hosonuma
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Jan 11, 1988
Inventors
Tsutomu Nishizawa
Yasuyuki Yamada
Junichi Fujio
Shin Hosonuma
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.