Patents by Inventor Qianwang Chen

Qianwang Chen 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 the preparation of diamond, graphite or their mixture
    Patent number: 7270707
    Abstract: The present invention provides a method of preparation for diamond, graphite or mixtures of diamond and graphite by reduction of CO or CO2. Said method comprises a step of contacting an active metal capable of reducing a carbon source into elementary carbon with carbon source (such as CO and/or CO2 and/or their origin) under conditions suitable to reduce the carbon source to elementary carbon in the course of a reduction reaction. After the raw diamond or mixtures of diamond and graphite thus obtained are subjected to intensive heat treatment with perchloric acid, pure diamond granules are obtained. The present method employs relatively low reaction temperature and pressure and the facilities needed in the method are simple and easy to operate. Diamond finally obtained has good crystallinity and free of impurities with granule size of several hundred micrometer.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: September 18, 2007
    Assignee: University of Science and Technology of China
    Inventors: Qianwang Chen, Yitai Qian, Zhengsong Lou
  • Process for producing diamond, graphite or mixture of diamond and graphite
    Publication number: 20060011127
    Abstract: The present invention provides a method of preparation for diamond, graphite or mixtures of diamond and graphite by reduction of CO or CO2. Said method comprises a step of contacting an active metal capable of reducing a carbon source into elementary carbon with carbon source (such as CO and/or CO2 and/or their origin) under conditions suitable to reduce the carbon source to elementary carbon in the course of a reduction reaction. After the raw diamond or mixtures of diamond and graphite thus obtained are subjected to intensive heat treatment with perchloric acid, pure diamond granules are obtained. The present method employs relatively low reaction temperature and pressure and the facilities needed in the method are simple and easy to operate. Diamond finally obtained has good crystallinity and free of impurities with granule size of several hundred micrometer.
    Type: Application
    Filed: November 15, 2002
    Publication date: January 19, 2006
    Applicant: University of Science and Technology of China
    Inventors: Qianwang Chen, Yitari Qian, Zhengsong Lou