Engineering
| Tue 26 May 2026
Beijing, May 26 -- Zhejiang Lisheng Spring Co Ltd has sought patent for Method for Predicting Service Life of Pneumatic Dustproof Ring of Piston Rod. This invention was developed by Yu Xujie, Liu Zhou, Zheng Leyong, Zheng Yaoqin, Huang Zhongyin, Guo Linli, Ye Linhua, Lu Feifei, Liu Jing and Lin Juxiu.
The patent application n..