Granted Patent
Utility
US 5,987,408 · App. 08/767,503
Automated directory assistance system utilizing a heuristics model for predicting the most likely requested number
Inventor:
Vishwa Gupta
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: Dec 16, 1996
Inventor
Vishwa Gupta
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.