Granted Patent
Utility
US 5,642,403 · App. 08/393,904
Portable telephone set tracking connection system in mobile communication network
Inventor:
Junichi Koyama
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: Feb 24, 1995
Inventor
Junichi Koyama
Assignee (at issue)
NEC CORPORATION
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.