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:
Aug. 01, 2000
Filed:
Nov. 25, 1998
Hajime Yuzurihara, Kanagawa, JP;
Hiroshi Deguchi, Kanagawa, JP;
Michiaki Shinotsuka, Kanagawa, JP;
Takashi Shibaguchi, Kanagawa, JP;
Makoto Harigaya, Kanagawa, JP;
Mikio Kinoshita, Kanagawa, JP;
Yoshiyuki Kageyama, Kanagawa, JP;
Michiharu Abe, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A phase-change optical recording medium has a substrate, and a lower heat-resistant protective layer, a recording layer capable of recording and erasing information by utilizing changes in the phase of a phase-change recording material in the recording layer, an upper heat-resistant protective layer and a light reflecting and heat dissipating layer, which are successively overlaid on the substrate in this order, the recording material including Ag, In, Sb and Te as the main elements, at least one additional element selected from the group (1) consisting of B, C, N, Al, Si and P, and at least one additional element selected from the group (2) consisting of halogen atoms and alkali metal elements.