ALEXANDRIA, Va., June 6 -- United States Patent no. 12,283,058, issued on April 22, was assigned to North China University of Technology (Beijing) and University of Science and Technology Beijing (Beijing).

"Method and system for analyzing global average grayscale change of tundish ink tracing experiment" was invented by Lifeng Zhang (Beijing), Haojian Duan (Beijing), Dinghan Li (Beijing), Yuexin Zhang (Beijing), Wei Chen (Beijing) and Ying Ren (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method analyzes global average grayscale change of tundish ink tracing experiment. The method includes the following steps: building a water model based on a prototype size and production parameters of a tundis...