Group 1 - The State Intellectual Property Office of China has reported that Sinopec Limited and its subsidiaries have applied for a patent titled "A Carbon Solid Ceramic Proppant and Its Preparation Method and Application," with publication number CN120310550A, and the application date is January 2024 [1] - The patent describes a carbon solid ceramic proppant with a core-shell structure, where the core is made from waste FCC catalyst, silica, high iron materials, fluxing agents, and a first binder, while the shell consists of calcium compounds and a second binder, and a biodegradable membrane wraps the structure [1] Group 2 - Sinopec Limited, established in 2000 and based in Beijing, primarily engages in oil and gas extraction, with a registered capital of 12,173,968.9893 million RMB, and has invested in 263 companies and participated in 5,000 bidding projects [1] - Sinopec Petroleum Engineering Technical Service Co., Ltd., founded in 1994 and located in Beijing, focuses on civil engineering construction, with a registered capital of 1,898,434.0033 million RMB, having invested in 14 companies and participated in 136 bidding projects [2] - Sinopec Petroleum Engineering Design Co., Ltd., established in 2003 in Dongying, specializes in professional technical services, with a registered capital of 31,800 million RMB, having invested in 3 companies and participated in 4,426 bidding projects [2] - Sinopec Petroleum and Chemical Research Institute Co., Ltd., founded in 2022 in Beijing, is dedicated to research and experimental development, with a registered capital of 30,000 million RMB, having invested in 2 companies and participated in 1,458 bidding projects [2]