Patents by Inventor Zengxia Wang

Zengxia Wang 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).

  • CRYSTAL OF POLYMYXIN B1 SULFATE, POLYMYXIN B2 SULFATE OR THEIR MIXTURE AND PREPARATION METHOD THEREOF
    Publication number: 20210283213
    Abstract: The present invention provides an anhydrous crystal of polymyxin B1 sulfate, polymyxin B2 sulfate or a mixture thereof and a preparation method thereof. The preparation method comprises using an organic solvent to precipitate a solid from a saturated solution of polymyxin B1 sulfate, polymyxin B2 sulfate or a mixture thereof, drying it under vacuum to obtain an anhydrous crystal of polymyxin B1 sulfate, polymyxin B2 sulfate or a mixture thereof.
    Type: Application
    Filed: August 19, 2016
    Publication date: September 16, 2021
    Applicant: Hubei Ruihaoanke Pharmaceutical Technology Development Co., Ltd.
    Inventors: Xiaobing Li, Fen Luo, Zengxia Wang, Yanwei Xu, Changhong Li
  • POLYMYXIN B SULFATE CRYSTAL AND PREPARATION METHOD THEREOF
    Publication number: 20190256557
    Abstract: The present invention provides a polymyxin B sulfate crystal and a preparation method thereof. Said method comprises the following steps of: adsorbing a polymyxin B fermentation liquid with a resin, and adding sulfuric acid or acidic ethanol for desorbing; concentrating to obtain a saturated solution of polymyxin B sulfate; and using an organic solvent to precipitate a crystal from the saturated solution, filtering and drying to obtain the polymyxin B sulfate crystal.
    Type: Application
    Filed: August 19, 2016
    Publication date: August 22, 2019
    Applicant: Hubei Ruihaoanke Pharmaceutical Technology Development Co., Ltd.
    Inventors: Zengxia Wang, Xiaobing Li, Fen Luo, Changhong Li, Yanwei Xu, Long Chen