Patents by Inventor Chunhua Xu

Chunhua Xu 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).

  • Patent number: 11984666
    Abstract: An object of the present disclosure is to provide a radiation element and a bandwidth extension structure. The radiation element according to the present disclosure comprises: a basic radiation element and one or more bandwidth extension structures; wherein the one or more bandwidth extension structures are mounted on the basic radiation element to extend the operating bandwidth of the basic radiation element. The bandwidth extension structure according to the present disclosure is mounted on the basic radiation element to extend the operating band of the basic radiation element.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: May 14, 2024
    Assignee: RFS Technologies, Inc.
    Inventors: Jiankai Xu, Ke Chen, Chunhua Zhou, Jing Liu, Jihong Sun
  • Publication number: 20240098830
    Abstract: This application provides a communication method and apparatus. The method is applied to a terminal device, and the method includes: receiving first small data transmission SDT configuration information from a first network device, where the first SDT configuration information corresponds to a first network slice; and sending a radio resource control RRC resume request message and data of the first network slice to the first network device based on the first SDT configuration information. According to this application, a network slice-based SDT solution can be implemented, so that requirements of different users are met.
    Type: Application
    Filed: November 29, 2023
    Publication date: March 21, 2024
    Inventors: Chunhua YOU, Xiaoying XU
  • Patent number: 11932614
    Abstract: A method for preparing diazoxide includes reacting o-aminobenzenesulfonamide with N-chlorosuccinimide in a chlorine solvent to obtain 2-amino-5-chlorobenzenesulfonamide, mixing the 2-amino-5-chlorobenzenesulfonamide, an imidazole salt and an amide solvent, then heating same for reaction so as to obtain diazoxide; or mixing o-aminobenzenesulfonamide, an imidazole salt and an amide solvent, then heating same for reaction to obtain a compound IV; then reacting the compound IV with N-chlorosuccinimide in a chlorine solvent to obtain diazoxide. The application of imidazole hydrochloride as a catalyst in preparing diazoxide is also disclosed. The present invention avoids the use of highly corrosive and toxic chlorosulfonyl isocyanate, a strong acid (sulfuric acid), and a high reaction temperature (240-250° C.
    Type: Grant
    Filed: December 29, 2019
    Date of Patent: March 19, 2024
    Assignee: SOOCHOW UNIVERSITY
    Inventors: Chunhua Qiao, Yiwen Xu
  • Patent number: 7410912
    Abstract: Metal oxide nanowires are being investigated to make nanodevices and nanosensors. High operation temperatures or vacuum is required in the manufacturing of metal oxide nanowires by existing vapor phase evaporation methods. This invention provides a method of manufacturing metal oxide nanowires by first providing a metal to form a non-linear substantially planar structure defining a surface. The metal is then heated and maintained at a temperature from 300 to 800° C., and then exposed to oxygen and water vapor containing air stream for a sufficient period of time to form the metal oxide nanowires. The oxygen containing air stream flows in a direction substantially parallel to the plane of the structure. Relatively low temperatures may be used and no vacuum is required in this method, thereby reducing the overall manufacturing costs. Further, this method is able to manufacture different densities of the metal oxide nanowires simultaneously.
    Type: Grant
    Filed: September 2, 2005
    Date of Patent: August 12, 2008
    Assignee: The Hong Kong Polytechnic University
    Inventors: Chunhua Xu, San-Qiang Shi, Yang Liu, Chung Ho Woo
  • Publication number: 20070275567
    Abstract: Metal oxide nanowires are being investigated to make nanodevices and nanosensors. High operation temperatures or vacuum is required in the manufacturing of metal oxide nanowires by existing vapour phase evaporation methods. This invention provides a method of manufacturing metal oxide nanowires by first providing a metal to form a non-linear substantially planar structure defining a surface. The metal is then heated and maintained at a temperature from 300 to 800° C., and then exposed to oxygen and water vapour containing air stream for a sufficient period of time to form the metal oxide nanowires. The oxygen containing air stream flows in a direction substantially parallel to the plane of the structure. Relatively low temperatures may be used and no vacuum is required in this method, thereby reducing the overall manufacturing costs. Further, this method is able to manufacture different densities of the metal oxide nanowires simultaneously.
    Type: Application
    Filed: September 2, 2005
    Publication date: November 29, 2007
    Applicant: The Hong Kong Polytechnic University
    Inventors: Chunhua Xu, San-Qiang Shi, Yang Liu, Chung Woo
  • Patent number: D946636
    Type: Grant
    Filed: April 13, 2021
    Date of Patent: March 22, 2022
    Inventor: Chunhua Xu
  • Patent number: D947905
    Type: Grant
    Filed: April 8, 2021
    Date of Patent: April 5, 2022
    Inventor: Chunhua Xu