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:
Oct. 12, 1993
Filed:
Feb. 21, 1991
Shigeki Endo, Tokyo, JP;
Yuichi Ishino, Tokyo, JP;
Takayuki Maruyama, Tokyo, JP;
Tasuku Saito, Tokyo, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
The present invention relates to an electrorheological fluid which is capable of increasing viscosity under an application of electric potential difference. An electrorheological fluid according to the present invention comprises dielectric particulates dispersed in a highly electrically insulating oily medium, in which the particulates are carbonaceous particulates having an atomic ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and an average particle size of from 0.01 to 100 .mu.m, and the oily medium is an electrical insulating oil having a dielectric constant of not less than 3 and a volume resistivity of not less than 10.sup.9 .OMEGA..multidot.cm.