Granted Patent
Utility
US 4,868,846 · App. 07/221,079
Method for locking to the user's card in a portable radio telephone
Inventor:
Yrjo Kemppi
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Jul 19, 1988
Inventor
Yrjo Kemppi
Assignee (at issue)
Nokia-Mobira 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.