Granted Patent
Utility
US 5,844,977 · App. 08/828,784
On-hook customer premise equipment alerting signal detection
Inventors:
Brian McKinney, Stephen Kos
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Mar 27, 1997
Inventors
Brian McKinney
Stephen Kos
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.