ALEXANDRIA, Va., Oct. 6 -- United States Patent no. 12,752,399, issued on Oct. 6, was assigned to Shaoxing Ziyuan Polishing Co. Ltd. (Shaoxing, China).
"Composite abrasive paper" was invented by Senjun Chen (Shaoxing, China), Cuilan Ba (Shaoxing, China), Jin Zhang (Shaoxing, China), Xia Jiang (Shaoxing, China) and Jimin Li (Shaoxing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A composite abrasive paper has at least three surfaces which polished and ground to improve the utilization rate of the abrasive paper and reduce the cost of grinding and polishing abrasive tools. The abrasive paper comprises a first abrasive comprising a first substrate, a first stereo particle layer provided on a surface of ...