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. 04, 2009
Filed:
Feb. 20, 2004
Ken Makita, Shimamoto-cho, JP;
Eiji Sugiyama, Nishinomiya, JP;
Masaaki Aoiki, Takatsuki, JP;
Kaichi Murakami, Itami, JP;
Tadamichi Kawakubo, Tsukuba, JP;
Eiji Nakamura, Tsukuba, JP;
Ken Makita, Shimamoto-cho, JP;
Eiji Sugiyama, Nishinomiya, JP;
Masaaki Aoiki, Takatsuki, JP;
Kaichi Murakami, Itami, JP;
Tadamichi Kawakubo, Tsukuba, JP;
Eiji Nakamura, Tsukuba, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A permanent magnet for a particle accelerator and a magnetic field generator, in which Nd—Fe—B based magnets are used but are not demagnetized so easily even when exposed to a radiation, are provided. A permanent magnet for a particle accelerator is used in an environment in which the magnet is exposed to a radiation at an absorbed dose of at least 3,000 Gy. The magnet includes R (which is at least one of the rare-earth elements), B, TM (which is at least one transition element and includes Fe) and inevitably contained impurity elements. The magnet is a sintered magnet that has been magnetized to a permeance coefficient of 0.5 or more and that has a coercivity Hof 1.6 MA/m or more.