ALEXANDRIA, Va., March 19 -- United States Patent no. 12,251,779, issued on March 18, was assigned to CHANGZHOU SHINE SCIENCE & TECHNOLOGY Co.LTD. (Changzhou, China).

"Protective device for welding machine interlocking, design method and shield" was invented by Libin Liu (Changzhou, China) and Feng Sha (Changzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to the technical field of welding machine protection, specifically a protective device for interlocking welding machines, a design method, and a shield. The device includes: an inductive detection module to detect the relative position between the shield and a human head; a position detection module to detect the filter lens...