ALEXANDRIA, Va., May 12 -- United States Patent no. 12,622,350, issued on May 12, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).

"Grass trimming head and grass trimmer having the same" was invented by Jianpeng Guo (Nanjing, China), Toshinari Yamaoka (Nanjing, China), Fangjie Nie (Nanjing, China), Qi Zhang (Nanjing, China), Zongjing Li (Nanjing, China), Fei Wang (Nanjing, China) and Lanxi Xu (Nanjing, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A grass trimming head includes a housing assembly and a spool. The housing assembly is formed with a housing cavity and an outer aperture for allowing a cutting line to be inserted from an outside of the housing assembly into the housing c...