Granted Patent
Utility
US 5,783,653 · App. 08/811,717
Digital video substrate
Inventor:
Masaya Okamoto
Patented Case
View Patent ↗
Granted: Jul 21, 1998
Filed: Mar 6, 1997
Inventor
Masaya Okamoto
Assignee (at issue)
Idemitsu Petrochemical Co., 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.