Granted Patent
Utility
US 5,887,092 · App. 08/891,986
Optical non-linear branching element with MZ interferometer
Inventor:
Johannes Jacobus Gerardus Maria Van Der Tol
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Jul 14, 1997
Inventor
Johannes Jacobus Gerardus Maria Van Der Tol
Assignee (at issue)
Koninklijke KPN N.V.
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.