Granted Patent
Utility
US 6,138,031 · App. 08/983,012
Call establishment in a mobile communication system
Inventors:
Anna Sillanpaa, Hannu Toyryla, Tapio Paavonen
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Dec 22, 1997
Inventors
Anna Sillanpaa
Hannu Toyryla
Tapio Paavonen
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.