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:
Dec. 11, 2001
Filed:
Mar. 19, 1999
Hiroko Iwasaki, Tokyo, JP;
Kenichi Aihara, Numazu, JP;
Kyohji Hattori, Ebina, JP;
Akihiko Okamoto, Kawasaki, JP;
Yoshihiko Hotta, Mishima, JP;
Naoshi Mishima, Tokyo, JP;
Tetsuo Watanabe, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical data storage medium includes a substrate, an optical data storage layer overlaid on the substrate and a reversible image recording layer overlaid on the optical data storage layer, in which information is recorded in the reversible image recording layer so as to be visible. The reversible image recording layer, which includes a matrix resin and a low-molecular-weight organic substance dispersed in the matrix resin, may preferably be thermosensitive and change its transparency or color tone in response to heat.