Granted Patent
Utility
US 6,144,728 · App. 09/205,234
Information notification system in a public telephone system
Inventor:
Shinichi Ukon
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: Dec 4, 1998
Inventor
Shinichi Ukon
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.