The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2008
Filed:
Nov. 21, 2003
Sumio Ashida, Tokyo, JP;
Takayuki Tsukamoto, Kawasaki, JP;
Keiichiro Yusu, Yokohama, JP;
Katsutaro Ichihara, Yokohama, JP;
Noritake Ohmachi, Yokohama, JP;
Naomasa Nakamura, Yokohama, JP;
Nobuhisa Yoshida, Kamakura, JP;
Sumio Ashida, Tokyo, JP;
Takayuki Tsukamoto, Kawasaki, JP;
Keiichiro Yusu, Yokohama, JP;
Katsutaro Ichihara, Yokohama, JP;
Noritake Ohmachi, Yokohama, JP;
Naomasa Nakamura, Yokohama, JP;
Nobuhisa Yoshida, Kamakura, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A phase-change optical recording medium includes a phase-change optical recording film that permits reversible phase change between a crystalline phase and an amorphous phase upon irradiation with light, and an interface film formed of hafnium oxide, or a mixture of hafnium oxide and at least one oxide selected from the group consisting of cerium oxide, titanium oxide and zirconium oxide, and formed in contact with at least one surface of the phase-change optical recording film.