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. 25, 1994
Filed:
Jul. 20, 1992
Showa Denko Kabushiki Kaisha, Tokyo, JP;
Abstract
Magnetic particles for perpendicular magnetic recording, which are hexagonal ferrite particles having a hexagonal platelet shape, and are represented by the formula MM'.sub.x M'.sub.y Fe.sub.2x-y+2z O.sub.1+4x+3z (wherein M represents at least one element or a combination of elements selected from Ba, Sr, Ca and Pb; M' is at least one element or a combination of elements selected from Co, Zn and Mn; M' is at least one element or a combination of elements selected from Co, Ti, In, Zn, Mn, Ge, Nb, Zr, Ta, V and Sn, x is a number of z/4 to z, inclusive; y is a number of 0 to (x+z)/3, inclusive; and z is a number of 5.5 to 9.0, inclusive), and has an average particle size of from 0.01 to 0.3 .mu.m. The magnetic particles have a novel crystal structure different from both the magnetoplumbite structure and the spinel structure, even internally of the individual particles.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile