Granted Patent
Utility
US 5,835,571 · App. 08/721,408
Automated telephone service interface
Inventor:
William J. Johnson
Patented Case
View Patent ↗
Granted: Nov 10, 1998
Filed: Sep 26, 1996
Inventor
William J. Johnson
Assignee (at issue)
MCI Communications Corporation
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.