Granted Patent
Utility
US 5,307,138 · App. 07/877,637
Energy efficient modulation-demodulation optical system
Inventor:
Frederik Weindling
Patented Case
View Patent ↗
Granted: Apr 26, 1994
Filed: May 1, 1992
Inventor
Frederik Weindling
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.