Patents by Inventor Haiyan Xi

Haiyan Xi 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).

  • Crystalline form of gamma-aminobutyric acid and preparation method thereof
    Patent number: 10604474
    Abstract: A method for preparing a new crystalline form of ?-aminobutyric acid, including the steps of: S1: preparing a ?-aminobutyric acid solution at an initial concentration of 0.5-1.0 g/mL by adding crude ?-aminobutyric acid to water; adding an additive to the ?-aminobutyric acid solution, raising the temperature to 50-80° C., stirring to produce a clear solution; and S2: obtaining a suspension by evaporating water from the product of S1 under reduced pressure and at 50-80° C.; obtaining a wet product by filtering the suspension; drying the wet product to obtain the new crystalline form of ?-aminobutyric acid. The preparation method of the new crystalline form of ?-aminobutyric acid is simple, easy to operate, low in energy consumption, economical and environmentally friendly. It is suitable for large-scale industrial production.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: March 31, 2020
    Assignees: Nantong Licheng Biological Engineering Co., Ltd, Tianjin University
    Inventors: Junbo Gong, Kaifei Zhao, Haiyan Xi, Xiaohua Wu, Baohong Hou, Qiuxiang Yin, Jingkang Wang, Feng Jin, Shichao Du, Qinqing Gu, Shiping Tang
  • NEW CRYSTALLINE FORM OF GAMMA-AMINOBUTYRIC ACID AND PREPARATION METHOD THEREOF
    Publication number: 20190225574
    Abstract: A method for preparing a new crystalline form of ?-aminobutyric acid, including the steps of: S1: preparing a ?-aminobutyric acid solution at an initial concentration of 0.5-1.0 g/mL by adding crude ?-aminobutyric acid to water; adding an additive to the ?-aminobutyric acid solution, raising the temperature to 50-80° C., stirring to produce a clear solution; and S2: obtaining a suspension by evaporating water from the product of S1 under reduced pressure and at 50-80° C.; obtaining a wet product by filtering the suspension; drying the wet product to obtain the new crystalline form of ?-aminobutyric acid. The preparation method of the new crystalline form of ?-aminobutyric acid is simple, easy to operate, low in energy consumption, economical and environmentally friendly. It is suitable for large-scale industrial production.
    Type: Application
    Filed: November 7, 2016
    Publication date: July 25, 2019
    Inventors: Junbo Gong, Kaifei Zhao, Haiyan Xi, Xiaohua Wu, Baohong Hou, Qiuxiang Yin, Jingkang Wang, Feng Jin, Shichao Du, Qinqing Gu, Shiping Tang