ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,557,730, issued on Feb. 24, was assigned to NANJING CHERVON INDUSTRY Co. LTD. (Nanjing, China) and CHERVON (HK) Ltd. (Wanchai, Hong Kong).
"Grass trimmer" was invented by Jianpeng Guo (Nanjing, China), Maohui Li (Nanjing, China), Fangjie Nie (Nanjing, China) and Toshinari Yamaoka (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A grass trimmer includes a trimming head, a driving device for driving the trimming head to rotate so as to cut vegetation and an operating device for a user to operate so as to control the driving device. The trimming head includes a spool and a line holding element, the spool is used to wind a trimming line, and t...