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. 17, 2020
Filed:
Jan. 19, 2018
Sung-sik Park, Seoul, KR;
Sang-jin Kim, Busan, KR;
Sung-Sik Park, Seoul, KR;
Sang-Jin Kim, Busan, KR;
CHUNWOO TECH., LTD, Busan, KR;
Abstract
A composition for pickling a welded portion and a rust-generated portion according to installation of pipes, structures, plants, and so on formed of stainless steel, and for forming a passive state film thereon is provided. More particularly, the present disclosure relates to a neutral agent for passivating a surface of stainless steel metal in which a neutral agent is obtained by neutralizing a basic aqueous solution to 6.9 pH to 7.1 pH and aerated with carbon dioxide-free air to increase the amount of dissolved oxygen, so that an oxidation reduction potential in a range of 170 mV to 310 mV is obtained.