Granted Patent
Utility
US 4,228,449 · App. 05/973,513
Semiconductor diode array liquid crystal device
Inventor:
Paul O. Braatz
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Dec 26, 1978
Inventor
Paul O. Braatz
Assignee (at issue)
Hughes Aircraft Company
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.