Group 1 - China Petroleum & Chemical Corporation (Sinopec) and Sinopec Yizheng Chemical Fiber Company have applied for a patent titled "Co-polyester, Polyester Fiber Products and Their Preparation Methods and Applications" [1] - The patent application was published under CN120399209A with an application date of January 2024, focusing on the field of polymer chemistry [1] - The co-polyester described in the patent contains structural units A and B, with unit A being present in a greater quantity than unit B, and exhibits good flexibility, smoothness, and flame retardancy [1] Group 2 - China Petroleum & Chemical Corporation was established in 2000, located in Beijing, primarily engaged in oil and gas extraction, with a registered capital of approximately 12.17 billion RMB [1] - The company has invested in 263 enterprises, participated in 5000 bidding projects, and holds 5000 patent records along with 45 trademark records [1] - Sinopec Yizheng Chemical Fiber Company, founded in 2014 and based in Yangzhou, focuses on chemical fiber manufacturing with a registered capital of 400 million RMB [2] - This company has invested in 7 enterprises, participated in 5000 bidding projects, and holds 383 patent records along with 93 trademark records [2]