Granted Patent
Utility
US 5,134,506 · App. 07/440,557
Liquid crystal device having a phase plate and particular dye composition
Inventors:
Mitsuru Kano, Takemi Akimoto
Patented Case
View Patent ↗
Granted: Jul 28, 1992
Filed: Nov 22, 1989
Inventors
Mitsuru Kano
Takemi Akimoto
Assignee (at issue)
ALPS ELECTRIC CO., LTD.
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.