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. 06, 1997
Filed:
Feb. 27, 1995
Applicant:
Inventors:
Minoru Yamasaki, Ube, JP;
Junichi Kawano, Ube, JP;
Hideaki Sadamura, Onoda, JP;
Katsumi Yamashita, Ube, JP;
Assignee:
Toda Kogyo Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428403 ; 252 6264 ; 428404 ; 4286 / ; 428701 ; 428702 ; 428900 ;
Abstract
Co-coated acicular magnetite particles each comprising: acicular magnetite particle as the core particle; a lower coating layer of Co-containing spinel ferrite having a spinel structure, which is formed on the surface of said acicular magnetite particle; and an upper coating layer of Co- and Mg-containing spinel ferrite having a spinel structure, which is formed on said lower coating layer.