ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,408,583, issued on Sept. 9, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).
"String trimmer and trimming head thereof" was invented by Jianpeng Guo (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A string trimmer includes a trimming head, a driving device, and an operating device. The trimming head includes a spool, a head housing formed with an accommodating space, and a transmission member mounted to the spool that can move freely between the head housing and the spool in the direction of a straight line perpendicular to the direction of the rotation axis. The trimming line has an effective portion extending from th...