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, 1991
Filed:
Jul. 17, 1989
Osamu Saito, Takatsuki, JP;
Hisamitsu Kamezaki, Ibaraki, JP;
Masashi Suenaga, Ibaraki, JP;
Ryo Nagai, Hirakata, JP;
Shinichiro Iuchi, Ibaraki, JP;
Hitoshi Watanabe, Ibaraki, JP;
Hideo Fujiwara, Ibaraki, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
An optical data recording medium provided with a recording layer, the recording medium having excellent durability to light and heat, superior writing sensitivity and a high C/N value, wherein at least one a group of anion selected from a group of hexafluorophosphate ion (PF.sub.6 .sup.-), trifluoromethane sulfonate ion (CF.sub.3 SO.sub.3 .sup.-) or thiocyanate ion (SCN.sup.-) is present as the anion in an indol cyanine dye having a methyne chain present in the recording layer of the optical data recording medium.