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:
May. 28, 1985
Filed:
Jul. 26, 1982
Mamoru Soga, Osaka, JP;
Keiichi Yubakami, Neyagawa, JP;
Nobuo Sonoda, Settsu, JP;
Wataru Shimotsuma, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
This invention provides a magnetic fluid which is diversified in hue and stable in the electric fields. The magnetic fluid of this invention is composed of a dispersion of ferromagnetic particles dispersed by a surfactant, and a colorant having the same charge as the dispersing medium in said dispersing medium. The dyes effective for use in this invention are the nonionic azo dyes, anthrquinone dyes and metal-containing dyes, and the pigments useful in this invention are the organic or inorganic pigments treated so as to have an isoelectric point in the dispersing medium. A magnetic fluid having black color or other desired hues can be obtained by properly selecting the dye and/or pigment. The magnetic fluid of this invention exhibits its excellent properties particularly when used as a recording material.