Granted Patent
Utility
US 5,809,018 · App. 08/525,781
Group call method, a system controller and a subscriber station in a radio system
Inventor:
Mika Lehmusto
Patented Case
View Patent ↗
Granted: Sep 15, 1998
Filed: Dec 12, 1995
Inventor
Mika Lehmusto
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.