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. 17, 1999
Filed:
Jun. 23, 1997
Yasunobu Ueno, Yokohama, JP;
Tsutomu Satou, Yokohama, JP;
Tatsuya Tomura, Yokohama, JP;
Noboru Sasa, Yokohama, JP;
Yasuhiro Hgashi, Yokohama, JP;
Ricoh Co., Ltd., Tokyo, JP;
Abstract
An optical information recording medium which records at shorter laser wavelengths and has excellent light resistance and archival stability includes a supporting substrate and a recording layer coated on the substrate. The recording layer includes a metal chelated azo compound, the azo compound having the general formula (I): ##STR1## wherein X is NR.sup.6 group, oxygen or sulphur, wherein R.sup.6 is hydrogen or alkyl; Y is hydroxy, carboxy, or carbamoyl; each of R.sup.1 -R.sup.5 is independently hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted alkenyl, alkoxy, amino, halogen, nitro, cyano, trifluoromethyl, or carboxy, with the proviso that all of R.sup.1 -R.sup.5 are not simultaneously hydrogen; and the metal is a metal ion of Groups 3-12 of the Periodic Table.