Granted Patent
Utility
US 6,603,844 · App. 09/387,161
Advertised ring back in a telecommunication switching system
Inventors:
David Chavez, Stephen M. Thieler
Patented Case
View Patent ↗
Granted: Aug 5, 2003
Filed: Aug 31, 1999
Inventors
David Chavez
Stephen M. Thieler
Assignee (at issue)
Avaya Technology LLC
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.