Patents by Inventor Qiwei Duan

Qiwei Duan 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).

  • Process for the preparation of bistriphenylsilyl chromate
    Patent number: 5698723
    Abstract: Disclosed is a process for the preparation of bistriphenylsilyl chromate, wherein triphenylchlorosilane, potassium dichromate and any one selected from alkali metal oxides, alkali hydroxides and alkali metal carbonates are reacted in, as solvent, a mixture of glacial acetic acid and a hydrocarbon solvent at a certain temperature, whereby bistriphenylsilyl chromate having high purity can be obtained with high yield.
    Type: Grant
    Filed: August 16, 1996
    Date of Patent: December 16, 1997
    Assignees: China Paeto-Chemical Corporation, Research Institute of Petroleum Processing SINOPEC
    Inventors: Longxiu Dai, Qiwei Duan, Hongbo Ji, Xiaoyuan Wang, Jinqiang Mo, Jinfeng Wang, Hongmei Liu, Xiuqin Li, Jiuhua Chen, Ping Gao