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:
Jun. 11, 2019
Filed:
Jan. 29, 2016
Nittan Valve Co., Ltd., Kanagawa, JP;
Sukegawa Electric Co., Ltd., Ibaraki, JP;
Shigeru Uchida, Kanagawa, JP;
Ryo Onose, Kanagawa, JP;
Koichi Homma, Kanagawa, JP;
Kuniaki Miura, Ibaraki, JP;
Masashige Hanawa, Ibaraki, JP;
NITTAN VALVE CO., LTD., Kanagawa, JP;
SUKEGAWA ELECTRIC CO., LTD., Ibaraki, JP;
Abstract
It is preferable that metallic sodium to be loaded to an engine valve used for an internal combustion engine such as automobile engine have high purity. However, conventionally, an organic solvent remaining in micropores on a surface of the metallic sodium have been hardly attracted attention. Provided is a method for purifying metallic sodium including steps of placing metallic sodium containing organic solvent in the micropores thereof in a melting tank which is sealed, and heating the melting tank under reduced pressure to vaporize and remove the organic solvent coating the metallic sodium.