Patents by Inventor Yufen Zhang

Yufen Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • METHOD FOR PREPARING 3,3',4,4'-DICYCLOHEXYLTETRACARBOXYLIC ACID AND METHOD FOR TREATING ACIDIC WASTEWATER
    Publication number: 20240043364
    Abstract: A method for preparing 3,3?,4,4?-dicyclohexyltetracarboxylic acid and a method for treating an acidic wastewater are provided. In the preparation method according to the present disclosure, a ruthenium-rhodium mixed catalyst is used to catalyze the hydrogenation reduction reaction, which improves the selectivity of the reaction and reduces the generation of isomers, thereby reducing the generation of by-products and increasing the purity of 3,3?,4,4?-dicyclohexyltetracarboxylic acid. The results of the examples show that the purity of 3,3?,4,4?-dicyclohexyltetracarboxylic acid prepared by the method according to the present disclosure is not less than 99.62%.
    Type: Application
    Filed: August 23, 2021
    Publication date: February 8, 2024
    Inventors: Shuai SHAO, Yuntang ZHANG,, Wenge LI, Yufen ZHANG, Jingxiao WANG, Feiyang WANG, Qin YAN, Xiao WANG, Tiecheng LIU
  • Watch casing
    Patent number: D913291
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: March 16, 2021
    Inventor: Yufen Zhang