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:
Apr. 05, 1977
Filed:
Dec. 01, 1975
Applicant:
Inventors:
Shin-ichiro Dezawa, Odawara, JA;
Yasuo Tamai, Odawara, JA;
Assignee:
Fuji Photo Film Co., Ltd., Minami-ashigara, JA;
Primary Examiner:
Int. Cl.
CPC ...
C25C / ;
U.S. Cl.
CPC ...
204130 ;
Abstract
Ferromagnetic particles having a high squareness ratio, high coercivities, and stable magnetic properties are prepared by electrolyzing ferromagnetic particles in an aqueous electrolyte using a cathode carrying ferromagnetic particles. The ferromagnetic particles thus treated may be then subjected to a heat treatment, if desired. When the ferromagnetic particles are iron oxide particles, the aqueous electrolyte contains a compound of a transition element.