Granted Patent
Utility
US 6,219,471 · App. 09/232,109
Optical device having equal length waveguide paths
Inventor:
Christopher Doerr
Patented Case
View Patent ↗
Granted: Apr 17, 2001
Filed: Jan 15, 1999
Inventor
Christopher Doerr
Assignee (at issue)
LUCENT TECHNOLOGIES INC.
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.