Group 1 - The State Intellectual Property Office of China has granted a patent for a method of analyzing residual oil distribution to Shaanxi Yanchang Petroleum International Energy Chemical Co., Ltd. and Novus Energy Co., Ltd. [1] - The patent is titled "A Method for Analyzing Residual Oil Distribution Patterns" and has an authorization announcement number of CN120065332B [1] - The application date for the patent was February 2025 [1]