Granted Patent
Utility
US 6,393,180 · App. 09/204,148
Providing a refractive index change in an ion diffused material
Inventors:
Mark Farries, Barrie Keyworth, Jan Ingenhoff, Norbert Fabricius
Patented Case
View Patent ↗
Granted: May 21, 2002
Filed: Dec 3, 1998
Inventors
Mark Farries
Barrie Keyworth
Jan Ingenhoff
Norbert Fabricius
Assignee (at issue)
JDS Fitel 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.