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:
Mar. 18, 2014
Filed:
Sep. 10, 2007
Hiroshi Nagata, Ibaraki, JP;
Kyuzo Nakamura, Kanagawa, JP;
Takeo Katou, Kanagawa, JP;
Atsushi Nakatsuka, Kanagawa, JP;
Ichirou Mukae, Kanagawa, JP;
Masami Itou, Kanagawa, JP;
Ryou Yoshiizumi, Kanagawa, JP;
Yoshinori Shingaki, Ibaraki, JP;
Hiroshi Nagata, Ibaraki, JP;
Kyuzo Nakamura, Kanagawa, JP;
Takeo Katou, Kanagawa, JP;
Atsushi Nakatsuka, Kanagawa, JP;
Ichirou Mukae, Kanagawa, JP;
Masami Itou, Kanagawa, JP;
Ryou Yoshiizumi, Kanagawa, JP;
Yoshinori Shingaki, Ibaraki, JP;
ULVAC, Inc., Kanagawa, JP;
Abstract
A permanent magnet is provided which has formed a Dy, Tb film on a surface of an iron-boron-rare earth sintered magnet of a predetermined shape, with diffusion thereof into grain boundary phases, having a higher coercive force. The method of manufacturing a permanent magnet includes a film-forming step of evaporating metal evaporating material containing at least one of Dy and Tb and adhering evaporated metal atoms to a surface of the iron-boron-rare earth sintered magnet, and a diffusing step of performing heat treatment to diffuse metal atoms adhered to the surface into grain boundary phases of the sintered magnet. The metal evaporating material contains at least one of Nd and Pr.