Granted Patent
Utility
US 6,667,939 · App. 09/665,044
Optical disk and optical recording apparatus for said disk
Inventor:
Harukazu Miyamoto
Patented Case
View Patent ↗
Granted: Dec 23, 2003
Filed: Sep 19, 2000
Inventor
Harukazu Miyamoto
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.