Granted Patent
Utility
US 6,690,890 · App. 09/520,772
Single fiber Sagnac interferometer based secure communication system
Inventors:
Eric Udd, Michael M. Morrell, Peter Snawerdt
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Mar 8, 2000
Inventors
Eric Udd
Michael M. Morrell
Peter Snawerdt
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.