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:
Feb. 12, 1991
Filed:
Jan. 11, 1989
Applicant:
Inventors:
Keiso Mori, Hiroshima, JP;
Masaru Kawabata, Saeki, JP;
Masao Kunishige, Hiroshima, JP;
Nanao Horiishi, Hiroshima, JP;
Koji Toda, Hiroshima, JP;
Assignee:
Toda Kogyo Corporation, Hiroshima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
252 6259 ;
Abstract
Disclosed herein are sphere-like magnetite particles showing an apparent density of from 0.40 to 1.00 g/cm.sup.3 and a high thermo-stability and containing from 0.1 to 5.0 atomic % of Si to Fe, and a process for producing the sphere-like magnetite particles.