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:
Oct. 10, 1989
Filed:
Apr. 15, 1987
Applicant:
Inventors:
Atsushi Takedoi, Hiroshima, JP;
Hiroyuki Kondo, Hiroshima, JP;
Masaru Isoai, Hiroshima, JP;
Yoshitaka Yoshinaga, Hiroshima, JP;
Tosiharu Harada, Hiroshima, JP;
Yosiro Okuda, Hiroshima, JP;
Hiroshi Sumita, Hiroshima, JP;
Hirofumi Kawasaki, Hiroshima, JP;
Kohji Mori, Hiroshima, JP;
Assignee:
Toda Kogyo Corp., Hiroshima, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
252 6259 ;
Abstract
Disclosed herein are magnetic iron oxide particles comprising spindle-like magnetite or maghemite particles having an aspect ratio(major:minor) of less than 4:1 and containing 0.1 to 20 atomic % of Si to Fe, and a process for producing the same.