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:
Sep. 14, 2004
Filed:
Sep. 14, 2001
Makoto Harigaya, Kanagawa, JP;
Katsuhiko Tani, Tokyo, JP;
Noriyuki Iwata, Kanagawa, JP;
Kazunori Ito, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Eiko Hibino, Kanagawa, JP;
Hiroko Ohkura, Kanagawa, JP;
Nobuaki Onagi, Kanagawa, JP;
Hiroshi Miura, Kanagawa, JP;
Yoshiyuki Kageyama, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A phase-change optical information recording medium capable of recording information therein, reproducing recorded information therefrom, rewriting recorded information, and erasing recorded information therefrom, which phase-change optical information recording medium is provided with a recording layer containing therein a phase-change recording material including Ge, Ga, Sb, Te, and one element selected from the group consisting of Mg and Ca, which recording material is capable of performing a reversible phase transition from a noncrystalline phase to a crystalline phase and vice verse with the application of an electromagnetic wave thereto.