Granted Patent
Utility
US 4,643,529 · App. 06/684,136
Polarizing film
Inventors:
Sin Hosonuma, Junichi Fujio, Kozo Tanaka, Harue Suzuki, Kenichi Baba
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Dec 20, 1984
Inventors
Sin Hosonuma
Junichi Fujio
Kozo Tanaka
Harue Suzuki
Kenichi Baba
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.