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:
Dec. 24, 1991
Filed:
May. 30, 1989
Applicant:
Inventors:
Norimichi Nagai, Hiroshima, JP;
Norio Sugita, Hiroshima, JP;
Assignee:
Toda Kogyo Corp., Hiroshima, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428402 ; 428403 ; 428694 ; 252 6259 ;
Abstract
Disclosed herein are plate-like composite ferrite particles for magnetic recording comprising plate-like composite ferrite containing Ba particles having a composition represented by 19<(Fe+M)/Ba.ltoreq.22, wherein M represents at least one metal (II) selected from the group consisting of Co, Ni, Zn, Mn and Mg and at least one metal (IV) selected from the group consisting of Ti, Sn, Zr and Ge, in which Ba exists in the composition at a linear concentration gradient between the surface and the nucleation portion of said particles, and a process for producing such plate-like composite ferrite particles.