Granted Patent
Utility
US 6,823,420 · App. 09/798,695
Entertainment apparatus
Inventors:
Hideaki Io, Yasuyuki Yamamoto, Yuichi Inomata, Shinichi Fukushima, Shigekazu Hayashi
Patented Case
View Patent ↗
Granted: Nov 23, 2004
Filed: Mar 2, 2001
Inventors
Hideaki Io
Yasuyuki Yamamoto
Yuichi Inomata
Shinichi Fukushima
Shigekazu Hayashi
Assignee (at issue)
SONY COMPUTER ENTERTAINMENT INC.
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.