Granted Patent
Utility
US 6,473,497 · App. 09/208,414
Digital telephone set
Inventor:
Makoto Kondo
Patented Case
View Patent ↗
Granted: Oct 29, 2002
Filed: Dec 10, 1998
Inventor
Makoto Kondo
Assignee (at issue)
NEC INFRONTIA 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.