Granted Patent
Utility
US 6,633,639 · App. 09/001,019
Telephone switch configuration detector
Inventor:
James Donald Ludford
Patented Case
View Patent ↗
Granted: Oct 14, 2003
Filed: Dec 30, 1997
Inventor
James Donald Ludford
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.