Granted Patent
Utility
US 4,883,611 · App. 07/242,289
Dichroic coloring agents for liquid crystal displays
Inventors:
Keisuke Takuma, Sizuo Kuroda, Tsukasa Oyama, Hiroshi Aiga
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Sep 9, 1988
Inventors
Keisuke Takuma
Sizuo Kuroda
Tsukasa Oyama
Hiroshi Aiga
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.