Granted Patent
Utility
US 4,679,893 · App. 06/852,081
High switching frequency optical waveguide switch, modulator, and filter devices
Inventor:
O. Glenn Ramer
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Apr 14, 1986
Inventor
O. Glenn Ramer
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.