Patents by Inventor Zhong L. Du

Zhong L. Du 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).

  • Ba-Ca-Cu-O compositions superconducting at up to 126K and methods for making same
    Patent number: 6239080
    Abstract: A material having a superconducting transition temperature (Tc) of 126 K under ambient pressure has been identified. The superconducting material belongs to a Ba—Ca—Cu—O compound family where the cation ratio of Ba:Ca:Cu is 2:2.5+0.5:3.5±0.5. The superconducting material is produced from precursor oxides having nominal formula Ba2Can−1+xCuu/yOx wherein n=3 or 4 and x is 0.4 to 1.0 and y is 0 to 0.8 using high-pressure synthesis. Final synthesis temperature was maintained at less than 950° C. Formation of the superconducting material is sensitive to the state of the precursor oxides, the carbon content of the precursor, and the synthesis temperature, pressure and time.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: May 29, 2001
    Assignee: Thr University of Houston - University Park
    Inventors: Ching-Wu Chu, Yu-Yi Xue, Zhong L. Du