Granted Patent
Utility
US 6,567,504 · App. 09/425,865
Automated calling system with database updating
Inventors:
Kent E. Kercheval, Al Langsenkamp
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Oct 23, 1999
Inventors
Kent E. Kercheval
Al Langsenkamp
Assignee (at issue)
Sigma Communications, Inc.
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.