国家/地区 韩国（2）
IPC部 C（3）
IPC大类 C09（3）
IPC小类 C09D（3）
IPC C09D005/00（3）
发明人 CHOI J H（2） HWAN J E（2） JO C W（2）
KIM H D（2）
公开年 2023（3）
申请年 2022（3） 
专利权人

Preparing long-chain polymer glue used improve thread connection performance of oil pipe, comprises adding polyacrylic acid and catechol to deionized water, adding boric acid solution, adjusting pH with sodium hydroxide solution under nitrogen protection, and mechanically stirring.

FAN H, LI S, LI H, FANG X, TUO C, LIU Z, GAO Z, ZHANG Y, NAN B, WANG J

Breathable and waterproof safety helmet for inspection and diagnosis comprises safety helmet body that can be worn by workers performing safety inspection and diagnosis and has ventilation holes formed in the thickness direction.

CHOI J H, JO C W, KIM H D, HWAN J E

Waterproof helmet used in safety inspection and diagnosis applications, comprises helmet component, and waterproof film including concave-convex portion bonded to component through adhesive comprising crosslinking agent, viscosity modifier, tackifier, polypropylene and heat-resistant polyamide resin.

CHOI J H, JO C W, KIM H D, HWAN J E