ALEXANDRIA, Va., Aug. 5 -- United States Patent no. 12,697,689, issued on Aug. 4, was assigned to SHENZHEN HANQINGDA TECHNOLOGY Co. LTD. (Shenzhen, China).
"Visual laser engraving machine" was invented by Shoushan Hou (Shenzhen, China), Zhihuan Liu (Shenzhen, China) and Xiangying Chen (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A visual laser engraving machine includes a bottom plate, clamping assemblies and a product body. A portal frame is disposed around a surface of the bottom plate. An electrically controlled pulley is slidably connected with a horizontal slide rail at an inner side thereof. A laser device is slidably connected between longitudinal slide rails. A lower slide rail is ...