Granted Patent
Utility
US 6,819,939 · App. 10/097,404
Cellular phone with high-quality sound reproduction capability
Inventor:
Hitoshi Masamura
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Mar 15, 2002
Inventor
Hitoshi Masamura
Assignee (at issue)
NEC Viewtechnology, Ltd.
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.