Granted Patent
Utility
US 5,059,461 · App. 07/466,635
Optical disk substrate, optical information-storage medium, and process and apparatus for manufacturing the optical disk substrate
Inventors:
Kotaro Kojima, Yasumasa Shibata, Toshiki Shojima
Patented Case
View Patent ↗
Granted: Oct 22, 1991
Filed: Jan 17, 1990
Inventors
Kotaro Kojima
Yasumasa Shibata
Toshiki Shojima
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.