Granted Patent
Utility
US 6,678,358 · App. 09/845,236
Automated nodal calling system
Inventors:
Al Langsenkamp, Kent E. Kercheval
Patented Case
View Patent ↗
Granted: Jan 13, 2004
Filed: Apr 30, 2001
Inventors
Al Langsenkamp
Kent E. Kercheval
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.