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, 2024
Filed:
Nov. 18, 2019
Nippon Paint Holdings Co., Ltd., Osaka, JP;
Hiroyuki Sakamoto, Osaka, JP;
NIPPON PAINT HOLDINGS CO., LTD., Osaka, JP;
Abstract
Provided is a magnetorheological fluid having excellent long-term dispersion stability of magnetic particles and a large maximum change of yield stress under magnetic field application conditions. Also provided is a device having excellent long-term stable drivability and mechanism reliability. The magnetorheological fluid contains magnetic particles, resin particles, and a dispersion medium, wherein the proportion constituted by the mass of the magnetic particles relative to the total mass of the magnetorheological fluid is 35 mass % to 95 mass %, the proportion constituted by the mass of the resin particles relative to the total mass of the magnetorheological fluid is 0.3 mass % to 20 mass %, and the average particle diameter of the resin particles is 20 nm to 1,500 nm. This magnetorheological fluid is used in the device.