Granted Patent
Utility
US 4,680,580 · App. 06/467,799
Active matrix-addressed liquid-crystal display device
Inventor:
Yukito Kawahara
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Feb 18, 1983
Inventor
Yukito Kawahara
Assignee (at issue)
Kabushiki Kaisha Daini Seikosha
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.