Patents by Inventor Weifeng Yi

Weifeng Yi 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).

  • Osmotic pump controlled release tablet and preparation method thereof
    Patent number: 9005661
    Abstract: An osmotic pump controlled release tablet and the preparation method thereof are disclosed. The osmotic pump controlled release tablet is composed of tablet core, semipermeable membrane and optional film coating. The material of said semipermeable membrane is composed of ethyl cellulose and povidone in the ratio of 1:1˜1:4 by weight. Said tablet core comprises drug containing layer and push layer. The osmotic pump controlled release tablet also characterizes in that; (1) the angle ?1 formed by the outer curved surface of the drug containing layer and the lateral surface is 120°-180°; and/or (2) the ratio of L1 to r is 0.27-1.0, wherein L1 is the vertical distance from the central vertex of the outer curved surface of the drug containing layer to the plane formed by the intersection line between the outer curved surface of the drug containing layer and the lateral surface, and r is the radius of the tablet core.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: April 14, 2015
    Assignee: Beijing Team Hospital Management Co., Ltd.
    Inventors: Qingwei Jiang, Weifeng Yi, Quanzhi Liu, Wenbin Yang, Junli Zheng
  • OSMOTIC PUMP CONTROLLED RELEASE TABLET AND PREPARATION METHOD THEREOF
    Publication number: 20120171287
    Abstract: An osmotic pump controlled release tablet and the preparation method thereof are disclosed. The osmotic pump controlled release tablet is composed of tablet core, semipermeable membrane and optional film coating. The material of said semipermeable membrane is composed of ethyl cellulose and povidone in the ratio of 1:1˜1:4 by weight. Said tablet core comprises drug containing layer and push layer. The osmotic pump controlled release tablet also characterizes in that; (1) the angle ?1 formed by the outer curved surface of the drug containing layer and the lateral surface is 120°-180°; and/or (2) the ratio of L1 to r is 0.27-1.0, wherein L1 is the vertical distance from the central vertex of the outer curved surface of the drug containing layer to the plane formed by the intersection line between the outer curved surface of the drug containing layer and the lateral surface, and r is the radius of the tablet core.
    Type: Application
    Filed: April 29, 2010
    Publication date: July 5, 2012
    Applicant: TEAM ACADEMY OF PHARMACEUTICAL SCIENCE
    Inventors: Qingwei Jiang, Weifeng Yi, Quanzhi Liu, Wenbin Yang, Junli Zheng