Granted Patent
Utility
US 5,148,444 · App. 07/234,188
Tunable single-frequency ring laser
Inventor:
Josef Berger
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Aug 18, 1988
Inventor
Josef Berger
Assignee (at issue)
Harmonic Lightwaves
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.