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:
Oct. 07, 2008
Filed:
Nov. 12, 2003
Yusuke Seki, Tokyo, JP;
Daisuke Suzuki, Kodaira, JP;
Kuniomi Ogata, Hachioji, JP;
Keiji Tsukada, Kashiwa, JP;
Yusuke Seki, Tokyo, JP;
Daisuke Suzuki, Kodaira, JP;
Kuniomi Ogata, Hachioji, JP;
Keiji Tsukada, Kashiwa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is provided a magnetic shield which can shield external magnetic fields in the direction of an axis of a tubular magnetic shield and in the direction vertical to the axis. A magnetic shield has a cylindrical ferromagnetic substance-having openings on both ends and two superconducting loops housed in the respective insides of superconducting loop containers-,-. The superconducting loops are constructed of high critical temperature superconducting wire. The two superconducting loops have semicircle shapes and are arranged in x-direction so as to be symmetrical with respect to an axis of the cylindrical ferromagnetic substance-. The superconducting loop containers-,-are arranged in the insides near both open ends of the cylindrical ferromagnetic substance-with supports. The superconducting loops are arranged to be vertical to the axis of the cylindrical ferromagnetic substance-. The superconducting loops are cooled by liquid nitrogen or a refrigerator. A lightweight, small magnetic shield having high operability can be realized.