ALEXANDRIA, Va., March 24 -- United States Patent no. 12,584,000, issued on March 24, was assigned to Jianhu Kaitai Petroleum Machinery Co. Ltd. (Yancheng city, China).

"Reduced graphene oxide nitrile rubber and method for preparing tooth-scar-free tooth block" was invented by Lizhong Wu (Yancheng city, China) and Dongfeng Li (Yancheng City, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a reduced graphene oxide nitrile rubber, comprising the following components in parts by weight: 100-140 parts of nitrile rubber, 30-90 parts of a reduced graphene oxide nitrile rubber masterbatch, 1.8-2.52 parts of a vulcanizing agent, 1.2-1.68 parts of a vulcanization accelerator, 5-7 parts of a vulcaniz...