Granted Patent
Utility
US 6,233,462 · App. 09/067,607
Portable terminal device for automatically controlling transmitting voice level and calling sound level
Inventor:
Hidefumi Kanai
Patented Case
View Patent ↗
Granted: May 15, 2001
Filed: Apr 28, 1998
Inventor
Hidefumi Kanai
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.