Granted Patent
Utility
US 5,548,438 · App. 08/173,837
Bidirectional optical amplifier
Inventor:
Jean-Marc Pierre Delavaux
Patented Case
View Patent ↗
Granted: Aug 20, 1996
Filed: Dec 23, 1993
Inventor
Jean-Marc Pierre Delavaux
Assignee (at issue)
AT&T CORP.
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.