Oil & Gas
| Mon 25 May 2026
Beijing, May 25 -- State Intellectual Property Office of China has released PetroChina patent application for Oil Nozzle Sleeve Wax Removal Device and Method. This invention was developed by Lei Yong, Huang Xinwen, Fang Youli, Fan Yinyin, Wang Yi, Li Hai, Zhang Juanjuan, Hu Yuxuan, Xian Ju, Wang Ruijun, Li Ronghui, Ma Yingbin, X..