Granted Patent
Utility
US 6,771,173 · App. 09/752,143
System and device for monitoring and signaling personnel presence
Inventors:
Diane J. Clayton, Stephen S. Jackson
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Dec 29, 2000
Inventors
Diane J. Clayton
Stephen S. Jackson
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.