Patents by Inventor Zhongyuan Liu

Zhongyuan Liu 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).

  • MINIATURE MICROPHONE, PROTECTION FRAME THEREOF AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20110026752
    Abstract: A miniature microphone is provided.
    Type: Application
    Filed: July 17, 2009
    Publication date: February 3, 2011
    Inventors: Rongguo Yao, Zhongyuan Liu, Xianbin Wang, Maoqiang Dang, Shaoyang Yao
  • Fabrication of High Performance Densified Nanocrystalline Bulk Thermoelectric Materials Using High Pressure Sintering Technique
    Publication number: 20100295202
    Abstract: The present invention provides a method for the fabrication of high performance densified nanocrystalline bulk thermoelectric material, comprising: (1) preparing a thermoelectric alloy nanopowders by a ball milling process to achieve an average crystal size of 5-30 nm, and (2) preparing the nanocrystalline bulk thermoelectric material by high pressure sintering at a temperature of 0.25-0.8 Tm under a pressure of 0.8-6.0 GPa for 10-120 minutes, to achieve a relative density of 90-100% and an average grain size of 10-50 nm. The method is easy to operate and allows the production of a thermoelectric material with a ZT value higher than 2. In addition, the method can ensure both good thermoelectric properties and high density, and therefore have important applications for energy industry.
    Type: Application
    Filed: August 14, 2009
    Publication date: November 25, 2010
    Applicant: YANSHAN UNIVERSITY
    Inventors: Yongjun Tian, Fengrong Yu, Dongli Yu, Jianjun Zhang, Bo Xu, Zhongyuan Liu, Julong He