Granted Patent
Utility
US 6,324,271 · App. 09/375,396
System and method for authentication of caller identification
Inventors:
W. Donald Sawyer, Patrick Michael O'Shaughnessey, Christian P. Gilby
Patented Case
View Patent ↗
Granted: Nov 27, 2001
Filed: Aug 17, 1999
Inventors
W. Donald Sawyer
Patrick Michael O'Shaughnessey
Christian P. Gilby
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.