Granted Patent
Utility
US 4,867,515 · App. 07/228,473
All-optical modulator with a channel waveguide
Inventor:
Richard J. F. Normandin
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Aug 5, 1988
Inventor
Richard J. F. Normandin
Assignee (at issue)
Canadian Patents and Development Limited
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.