Granted Patent
Utility
US 6,490,236 · App. 09/654,178
Method and apparatus for optical disk device
Inventors:
Yasushi Fukuda, Toshifumi Takeuchi, Nobuhiro Tokushuku
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Sep 1, 2000
Inventors
Yasushi Fukuda
Toshifumi Takeuchi
Nobuhiro Tokushuku
Assignee (at issue)
HITACHI, 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.