Granted Patent
Utility
US 6,714,825 · App. 09/434,481
Multi-channel audio reproducing device
Inventor:
Yoshiichi Tanaka
Patented Case
View Patent ↗
Granted: Mar 30, 2004
Filed: Nov 5, 1999
Inventor
Yoshiichi Tanaka
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, 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.