Granted Patent
Utility
US 4,390,595 · App. 06/088,269
Environmentally protected IR windows
Inventor:
Frederick G. Yamagishi
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Oct 25, 1979
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.