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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.:

US 12456566 B1

PDFFull Text
Date of Patent:
Oct. 28, 2025

Filed:

Mar. 01, 2022

Cryocooler and magnetic shield

Applicant:

Sumitomo Heavy Industries, Ltd., Tokyo, JP;

Inventors:

Yosuke Matsumura, Nishitokyo, JP;

Takaaki Morie, Yokosuka, JP;

Jun Yoshida, Yokosuka, JP;

Assignee:

SUM ITOMO HEAVY INDUSTRIES, LTD., Tokyo, JP;

Attorney:

HEA Law PLLC

Primary Examiner:

Brian M King

Int. Cl.
CPC ...
F25B 9/14 (2006.01); F25B 9/00 (2006.01); F25B 9/10 (2006.01); F25D 19/00 (2006.01); G01R 33/38 (2006.01); G01R 33/3815 (2006.01); G01R 33/421 (2006.01); H01F 6/04 (2006.01); H05K 9/00 (2006.01);
U.S. Cl.
CPC ...
H01F 6/04 (2013.01); F25B 9/002 (2013.01); F25B 9/10 (2013.01); F25B 9/145 (2013.01); F25D 19/006 (2013.01); G01R 33/3804 (2013.01); G01R 33/3806 (2013.01); G01R 33/3815 (2013.01); G01R 33/421 (2013.01); H05K 9/0075 (2013.01); F25B 2309/001 (2013.01); F25B 2309/1406 (2013.01); F25B 2309/1428 (2013.01); F25B 2500/11 (2013.01); F25B 2500/12 (2013.01);
Abstract

A cryocooler includes a second-stage cooling stage, a second cylinder which includes the second-stage cooling stage on a terminal of the second-stage cylinder, a second-stage displacer which includes a magnetic regenerator material and is accommodated in the second-stage cylinder so as to be able to reciprocate in the second-stage cylinder, and a tubular magnetic shield which is installed on the second-stage cooling stage and extends along the second-stage cylinder outside the second-stage cylinder. The magnetic shield is formed of a normal conductor and a product of an electrical conductivity in a temperature range of 10 K (Kelvin) or less and a thickness of the tubular magnetic shield is 60 MS (Mega-Siemens) to 1980 MS.

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