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:
Aug. 03, 1982
Filed:
Jan. 30, 1981
Applicant:
Inventors:
Kazushi Ohshima, Yokohama, JP;
Mitsuro Matsunaga, Kamakura, JP;
Haruo Sekiguchi, Chigasaki, JP;
Kazuhiro Imaoka, Kamakura, JP;
Fujio Hayashi, Yokohama, JP;
Assignee:
Mitsui Toatsu Chemicals, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ; H01F / ;
U.S. Cl.
CPC ...
75 / ; 75 / ; 148105 ; 252 6255 ; 252 6256 ; 252 6262 ; 252 6263 ;
Abstract
Disclosed is a process for preparing fine needle-like, ferromagnetic iron compound particles for use in magnetic recording in which needle-like iron oxyhydroxide fine particles prepared by simultaneously co-precipitating or cladding iron compound particles with an element of group II of the Periodic Table and manganese at atomic weight ratios of the element of group II of the Periodic Table and manganese to iron of from 0.001/100 to 10/100 and 0.005/100 to 10/100 respectively are reduced and/or oxidized under heating.