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. 23, 1988
Filed:
Aug. 11, 1986
Tokuya Ohata, Yokohama, JP;
Masatsune Kobayashi, Yokohama, JP;
Yuko Suga, Yokohama, JP;
Konoe Miura, Yokohama, JP;
Hiroshi Takimoto, Yokohama, JP;
Tomio Yoneyama, Kawasaki, JP;
Mitsubishi Chemical Industries Ltd., Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A black recording liquid suitable for use in ink-jet recording or as an ink for writing instruments comprises at least two water-soluble dyes and a liquid medium. Each of the dyes satisfies the condition defined by the following expression [I], and a mixture of these dyes satisfies the condition defined by the following expression [II]. ##EQU1## In these expressions, a* and b* are chromaticness indices defined in the CIE 1976 (L*, a*, b*) space, i indicates the ith dye of the dyes used together, and n is an integer of 2 or more.