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:
Nov. 01, 1988
Filed:
Dec. 07, 1987
Applicant:
Inventors:
Tsutomu Katamoto, Hiroshima, JP;
Norimichi Nagai, Hiroshima, JP;
Yasutaka Ota, Saeki, JP;
Katsunori Fujimoto, Hiroshima, JP;
Akihiko Hirayama, Onoda, JP;
Masao Kiyama, Kyoto, JP;
Assignee:
Toda Kogyo Corp., Hiroshima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
428403 ; 252 6259 ; 252 6262 ; 252 6263 ; 427127 ; 428693 ; 428694 ;
Abstract
Disclosed herein are Ba-containing plate-like magnetoplumbite type ferrite particles for magnetic recording containing ions of one metal (II) selected from Ni and Zn and ions of one metal (IV) selected from Ti, Sn and Zr, and having zinc incorporated as a solid solution close to the particle surface and the change of coercive force of said particles at a temperature of -20.degree. to 120.degree. C. in the range of -0.5 to +0.5 Oe/.degree.C., and a process for producing the same.