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:
Apr. 30, 2019
Filed:
Apr. 26, 2017
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Qian Bao, Nishitokyo, JP;
Mingyao Xu, Nishitokyo, JP;
Koji Yamada, Nishitokyo, JP;
Takaaki Morie, Yokosuka, JP;
SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
In a cryocooler, a displacer includes an internal space, and a working gas flows through the internal space. A cylinder reciprocally accommodates the displacer, and an expansion space for the working gas is formed between the cylinder and a bottom portion of the displacer. A plurality of annular protruding portions are provided on a bottom surface of the expansion space such as to form a multiplex structure. A plurality of annular recessed portions are provided on the bottom portion of the displacer such as to receive the plurality of annular protruding portions.