Granted Patent
Utility
US 6,469,575 · App. 09/810,505
Circuit for amplifying and outputting audio signals
Inventors:
Masashi Oki, Kazuhiro Okamoto
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Mar 19, 2001
Inventors
Masashi Oki
Kazuhiro Okamoto
Assignees (at issue)
MITSUBISHI ELECTRIC CORPORATION
MITSUBISHI ELECTRIC ENGINEERING COMPANY, LIMITED
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.