Granted Patent
Utility
US 5,215,799 · App. 07/663,468
Optical disk substrate and optical information-storage medium
Inventors:
Atsunobu Sakoda, Katsumi Uchiyama, Toshihiko Fujishima
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Mar 4, 1991
Inventors
Atsunobu Sakoda
Katsumi Uchiyama
Toshihiko Fujishima
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.