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:
Sep. 19, 1995
Filed:
Mar. 04, 1994
Eiji Nomura, Yokkaichi, JP;
Toshihiko Kawamura, Yokkaichi, JP;
Kenji Hatanaka, Yokkaichi, JP;
Nariaki Moriyama, Yokkaichi, JP;
Ishihara Sangyo Kaisha, Ltd., , JP;
Abstract
Acicular magnetic iron particles comprising acicular iron substrate particles having first layer consisting of at least one of hydrous oxides and anhydrous oxides of aluminum and zirconium and mixtures thereof and second layer consisting of hydrous oxides and anhydrous oxides of aluminum and mixtures thereof coated on the surfaces of the particles are produced by coating the surfaces of hydrated iron oxide particles as substrate with at least one of aluminum compounds and zirconium compounds, then heating the coated substrate particles to convert to hematite particles, thereafter coating the surfaces of the resultant hematite substrate particles with at least one of aluminum compounds, and then reducing under heat the coated hematite particles.