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:
Apr. 14, 1998
Filed:
Feb. 14, 1997
Applicant:
Inventors:
Yasushi Yamamoto, Tsukuba, JP;
Yoshiyuki Takeishi, Tsuchiura, JP;
Yutaka Kouda, Tsukuba, JP;
Tomoko Minagawa, Tsukuba, JP;
Takao Kanno, Tokyo, JP;
Assignee:
NOK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
252 6256 ; 252 6252 ; 252 6254 ;
Abstract
A fluorine-based magnetic fluid, which comprises (A) fine magnetic particles dispersed in (D) a perfluoropolyether base oil represented by the following general formula: