ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,398,490, issued on Aug. 26, was assigned to SHANDONG HAICHUAN HAIR ARTS Co. LTD. (Qingdao, China).
"Manufacturing method for layered hairpiece product" was invented by Lin Tao (Shandong, China) and Ying Tang (Shandong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention belongs to the technical field of wig production and specifically relates to a manufacturing method for layered hairpiece product. The manufacturing method for preparing layered hairpiece product comprises the following steps: step I. preparing a raw hairpiece; step II. cutting a manufacturing unit: cutting one or more manufacturing units having a trapezoidal shape...