Granted Patent
Utility
US 5,675,628 · App. 08/285,123
Method and apparatus for enabling roaming of subscriber among plural mobile radio systems, using mobile equipment accepting removable subscriber identity module
Inventor:
Petri Hokkanen
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: Aug 1, 1994
Inventor
Petri Hokkanen
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.