Patents by Inventor Chengzong JI

Chengzong JI 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).

  • Loudspeaker diaphragm and manufacturing method thereof
    Patent number: 9838817
    Abstract: A loudspeaker diaphragm, comprising a dome portion located at central position and a suspension ring portion located at edge position; the dome portion and/or the suspension ring portion comprise silk fabric and thermoplastic polyurethane combined with the silk fabric; and the silk fabric is coated with thermosetting adhesive. The method for manufacturing the loudspeaker diaphragm comprises following steps: a. coating the silk fabric with a thermosetting adhesive under a high temperature, and drying the silk fabric; b. hot pressing and combining the silk fabric and thermoplastic polyurethane to form a membrane; c. pressing the membrane to form the dome portion and/or the suspension ring portion. The dome portion, or both the dome portion and the suspension ring portion of the loudspeaker diaphragm comprise silk fabric coated with a thermosetting adhesive and thermoplastic polyurethane.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: December 5, 2017
    Assignee: GOERTEK INC.
    Inventors: Xiuli Chang, Yonghua Zhang, Chengzong Ji
  • LOUDSPEAKER DIAPHRAGM AND MANUFACTURING METHOD THEREOF
    Publication number: 20160295329
    Abstract: A loudspeaker diaphragm, comprising a dome portion located at central position and a suspension ring portion located at edge position; the dome portion and/or the suspension ring portion comprise silk fabric and thermoplastic polyurethane combined with the silk fabric; and the silk fabric is coated with thermosetting adhesive. The method for manufacturing the loudspeaker diaphragm comprises following steps: a. coating the silk fabric with a thermosetting adhesive under a high temperature, and drying the silk fabric; b. hot pressing and combining the silk fabric and thermoplastic polyurethane to form a membrane; c. pressing the membrane to form the dome portion and/or the suspension ring portion. The dome portion, or both the dome portion and the suspension ring portion of the loudspeaker diaphragm comprise silk fabric coated with a thermosetting adhesive and thermoplastic polyurethane.
    Type: Application
    Filed: April 24, 2014
    Publication date: October 6, 2016
    Inventors: Xiuli CHANG, Yonghua ZHANG, Chengzong JI