Granted Patent
Utility
US 6,228,457 · App. 09/399,108
Optical data storage medium
Inventors:
Takashi Ueno, Keiichiro Jinushi, Katsuhisa Aratani, Masaaki Iwasaki, Ryohei Miyake
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Sep 20, 1999
Inventors
Takashi Ueno
Keiichiro Jinushi
Katsuhisa Aratani
Masaaki Iwasaki
Ryohei Miyake
Assignees (at issue)
FURUYA METAL CO., LTD.
SONY GROUP CORPORATION
Sony Disc Technology 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.