Patents by Inventor Yuanqiang ZHANG

Yuanqiang ZHANG 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 forms of demethyleneberberine hydrochloride and preparation method therefor
    Patent number: 11242340
    Abstract: Provided are four crystal forms, A, B, C and D, of demethyleneberberine hydrochloride, and a preparation method therefor, and further provided are X-ray powder diffraction characteristic absorption peaks, infrared absorption peaks and DSC spectra of the four crystal forms. The X-ray powder diffraction characteristic diffraction peaks of the crystal forms are at about 8.205°, 8.805°, 10.817°, 14.835°, 15.479°, 16.668°, 17.492°, 18.529°, 20.656°, 21.536°, 23.538°, 25.657°, 26.192°, and 28.808°. A preparation method for the four crystal forms of the demethyleneberberine hydrochloride is also involved. The preparation method has a simple process, a high yield and a low cost; and has a high product purity and a stable quality.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: February 8, 2022
    Assignee: CHINA PHARMACEUTICAL UNIVERSITY
    Inventors: Yubin Zhang, Yuanqiang Zhang, Miao Zhang, Qingxia Li
  • Crystal Forms of Demethyleneberberine Hydrochloride and Preparation Method Therefor
    Publication number: 20200392129
    Abstract: Provided are four crystal forms, A, B, C and D, of demethyleneberberine hydrochloride, and a preparation method therefor, and further provided are X-ray powder diffraction characteristic absorption peaks, infrared absorption peaks and DSC spectra of the four crystal forms. The X-ray powder diffraction characteristic diffraction peaks of the crystal forms are at about 8.205°, 8.805°, 10.817°, 14.835°, 15.479°, 16.668°, 17.492°, 18.529°, 20.656°, 21.536°, 23.538°, 25.657°, 26.192°, and 28.808°. A preparation method for the four crystal forms of the demethyleneberberine hydrochloride is also involved. The preparation method has a simple process, a high yield and a low cost; and has a high product purity and a stable quality.
    Type: Application
    Filed: July 12, 2018
    Publication date: December 17, 2020
    Inventors: Yubin ZHANG, Yuanqiang ZHANG, Miao ZHANG, Qingxia LI