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:
Mar. 27, 2018
Filed:
Oct. 30, 2015
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Yuichiro Sugiyama, Nagoya, JP;
Kazuhiro Miyajima, Okazaki, JP;
Youichirou Yoshii, Shizuoka, JP;
Nobukazu Takagi, Shizuoka, JP;
Tomoyuki Nakano, Fuji, JP;
Takumi Otsubo, Shizuoka, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, Aichi, JP;
Abstract
There are provided a stock solution composition for fuel cell vehicle coolant used by dilution with a diluent comprising water and a method for producing the same, and further a fuel cell vehicle coolant composition having improved storage stability and a method for producing the same. The present invention relates to a method for producing a stock solution composition for fuel cell vehicle coolant, wherein the stock solution composition comprises at least one ethylene glycol compound selected from the group consisting of ethylene glycol, diethylene glycol, and triethylene glycol, and is used by dilution with a diluent comprising water, and the method comprises the following steps: (a) a step of selecting as a raw material an ethylene glycol compound having an ethylene glycol monoformate content of 60 ppm or less; or (b) a step of selecting as a raw material an ethylene glycol compound, wherein a 50% by mass aqueous solution of the ethylene glycol compound has a conductivity of 4.5 μS/cm or less after heating.