Granted Patent
Utility
US 6,434,393 · App. 09/341,103
Medium penetration call announcement in telecommunications system
Inventor:
Heikki Einola
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Jul 2, 1999
Inventor
Heikki Einola
Assignee (at issue)
Nokia Telecommunications Oy
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.