Granted Patent
Utility
US 4,405,692 · App. 06/327,385
Moisture-protected alkali halide infrared windows
Inventor:
Frederick G. Yamagishi
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Dec 4, 1981
Inventor
Frederick G. Yamagishi
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.