Group 1 - The State Intellectual Property Office of China has granted a patent titled "Explosion Overpressure Assessment Method, Device and Storage Medium" to Sinopec Limited and its affiliated companies, with the application date being November 2019 [1] - Sinopec Limited, established in 2000 and headquartered in Beijing, primarily engages in oil and gas extraction, with a registered capital of approximately 12.17 billion RMB [1] - Sinopec Limited has invested in 263 companies, participated in 5,000 bidding projects, holds 45 trademark registrations, and possesses 5,000 patents, along with 40 administrative licenses [1] Group 2 - Sinopec Safety Engineering Research Institute Co., Ltd., founded in 2021 and located in Qingdao, focuses on research and experimental development, with a registered capital of 499 million RMB [2] - The institute has invested in 4 companies, participated in 1,191 bidding projects, holds 15 trademark registrations, and has 1,737 patents, along with 15 administrative licenses [2] Group 3 - Sinopec National Petrochemical Project Risk Assessment Technology Center Co., Ltd., also established in 2021 and based in Qingdao, primarily engages in business services, with a registered capital of 30 million RMB [2] - The center has participated in 83 bidding projects, holds 4 trademark registrations, and possesses 79 patents, along with 4 administrative licenses [2]