PETROCHINA(SH:601857) Jin Rong Jie·2025-06-14 00:36Group 1 - The State Intellectual Property Office of China has published a patent application for a salt-resistant acrylamide-acrylic acid copolymer and its preparation method, filed by Kunshan Jingkun Oilfield Chemical Technology Co., Ltd., China National Petroleum Corporation, and China Petroleum Group Great Wall Drilling Engineering Co., Ltd. [1] - The patent application was filed on December 2023 and is identified as CN120137087A [1]. - The preparation method involves the precipitation polymerization of acrylamide, acrylic acid, and a hydrophobic monomer, resulting in the salt-resistant copolymer [1]. Group 2 - Kunshan Jingkun Oilfield Chemical Technology Co., Ltd. was established in 1994, located in Suzhou, with a registered capital of 3.88 million RMB [1]. - The company has participated in 34 bidding projects and holds 65 patents along with 21 trademark registrations [1]. - China National Petroleum Corporation was founded in 1990, based in Beijing, with a registered capital of 48.69 billion RMB [2]. - The corporation has invested in 112 companies and participated in 5,000 bidding projects, holding 5,000 patents and 1,446 trademarks [2]. - China Petroleum Group Great Wall Drilling Engineering Co., Ltd. was established in 2008, also located in Beijing, with a registered capital of 2.77 billion RMB [2]. - This company has invested in 3 enterprises and participated in 5,000 bidding projects, holding 1,767 patents and 16 trademarks [2].