Granted Patent
Utility
US 5,262,889 · App. 07/871,890
Optical frequency shifter
Inventor:
David Fink
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Apr 21, 1992
Inventor
David Fink
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.