Granted Patent
Utility
US 5,287,214 · App. 07/865,306
Fabry-Perot optical filters
Inventors:
Alexander J. Robertson, Stephen Day
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Apr 8, 1992
Inventors
Alexander J. Robertson
Stephen Day
Assignee (at issue)
Nortel Networks 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.