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. 17, 1996
Filed:
May. 09, 1995
Applicant:
Inventors:
Kazuo Nakata, Moriyama, JP;
Masaharu Hirai, Shiga-ken, JP;
Nobusuke Takumi, Kusatsu, JP;
Saburo Kato, Kusatsu, JP;
Assignee:
Ishihara Sangyo Kaisha, Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
252 6262 ; 252 6263 ; 252 6259 ; 423593 ;
Abstract
Ferromagnetic fine powder for magnetic recording, characterized by comprising platelet like ferrite crystal particles which have such a metallic element composition that the Ba/Fe molar ratio is 1/50 to 1/8 and that the total amount of Ni and Zn is less than 0.5 mole and not less than 0.07 mole per mole of Fe, a crystal phase of magnetoplumbite phase, spinel phase or composite phase thereof and a saturation magnetization of 60 emu/g or more; and a process for producing said ferromagnetic fine powder for magnetic record.