Patents by Inventor Wenjuan BAI

Wenjuan BAI 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).

  • Publication number: 20250208099
    Abstract: A method for determining the content of oxalic acid in dimethyl oxalate, comprising the following steps: determining the content of total acid in a dimethyl oxalate sample; determining the content of nitric acid in the dimethyl oxalate sample; subtracting the content of nitric acid from the content of total acid, and the resulting value is the content of oxalic acid in the dimethyl oxalate sample. The method overcomes the difficulty of measuring two mixed acids separately, avoids the problem of high determination results of oxalic acid caused by the reaction of nitric acid impurities, which are also acidic substances, during titration, and eliminates the interference of nitric acid and solution base.
    Type: Application
    Filed: April 26, 2022
    Publication date: June 26, 2025
    Inventors: Yachun ZHANG, Wenjuan BAI, Chunlei LI, Qizhong HUANG, Xihui GE
  • Patent number: 12285918
    Abstract: The present invention relates to a printing device and a printing method. The combination mode between materials in an additive manufacturing process is improved. A calculation unit is used for controlling an A pole unit and a B pole unit to be in contact with the materials, to form an energized circuit. The surface temperature of phase change material in the material between the A pole unit and the B pole unit is greater than or equal to a preset temperature so that the materials at a distance can be simultaneously combined.
    Type: Grant
    Filed: April 13, 2023
    Date of Patent: April 29, 2025
    Assignee: Qingdao University of Science and Technology
    Inventors: Yan He, Dianming Chu, Wenjuan Bai
  • Patent number: 11898265
    Abstract: Disclosed is a method for preparing a carbon material, comprising applying a voltage to an electrically conductive medium to form an electrically conductive path in an oxygen-free environment containing a carbon source and a catalyst to obtain the carbon material, wherein the electrically conductive medium includes a solid substrate or a liquid-phase electrically conductive system; under the condition that the electrically conductive medium is the liquid-phase electrically conductive system, the carbon material is obtained in the liquid-phase electrically conductive system; and under the condition that the electrically conductive medium is the solid substrate, the carbon material is obtained on a surface of the solid substrate.
    Type: Grant
    Filed: March 15, 2022
    Date of Patent: February 13, 2024
    Assignee: Qingdao University of Science & Technology
    Inventors: Yan He, Dianming Chu, Wenjuan Bai, Qianpeng Dong
  • Publication number: 20230241840
    Abstract: The present invention relates to a printing device and a printing method. The combination mode between materials in an additive manufacturing process is improved. A calculation unit is used for controlling an A pole unit and a B pole unit to be in contact with, the materials, to form an energized circuit. The surface temperature of phase change material in the material between the A pole unit and the B pole unit is greater than or equal to a preset temperature so that the materials at a distance can be simultaneously combined.
    Type: Application
    Filed: April 13, 2023
    Publication date: August 3, 2023
    Applicant: Qingdao University of Science and Technology
    Inventors: Yan He, Dianming Chu, Wenjuan Bai
  • Publication number: 20230212775
    Abstract: Disclosed is a method for preparing a carbon material, comprising applying a voltage to an electrically conductive medium to form an electrically conductive path in an oxygen-free environment containing a carbon source and a catalyst to obtain the carbon material, wherein the electrically conductive medium includes a solid substrate or a liquid-phase electrically conductive system; under the condition that the electrically conductive medium is the liquid-phase electrically conductive system, the carbon material is obtained in the liquid-phase electrically conductive system; and under the condition that the electrically conductive medium is the solid substrate, the carbon material is obtained on a surface of the solid substrate.
    Type: Application
    Filed: March 15, 2022
    Publication date: July 6, 2023
    Inventors: Yan HE, Dianming CHU, Wenjuan BAI, Qianpeng DONG