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:
Jul. 05, 1994
Filed:
Nov. 27, 1992
Applicant:
Inventors:
Yoshinobu Asako, Tsuchiura, JP;
Satoru Ono, Tsukuba, JP;
Minoru Aoki, Tsukuba, JP;
Izuho Okada, Tsukuba, JP;
Minoru Kobayashi, Tsukuba, JP;
Ryuji Aizawa, Tsukuba, JP;
Assignee:
Nippon Shokubai Co., Ltd., Osaka, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C10M / ; C10M / ;
U.S. Cl.
CPC ...
252 781 ; 252 73 ; 252572 ;
Abstract
An electrorheological fluid composition comprising a dispersion of disperse-phase particles formed of a sulfonated polymer possessing aromatic rings substituted with sulfonic acid groups in an electrically non-conducting oil which electrorheological fluid is characterized by the fact that the number of sulfonic acid groups in said sulfonated polymer forming said disperse-phase particles exceeds the number of aromatic rings present in said sulfonated polymer.