Chengzong JI

Follow

Person

WeiFang, CN

People

Patents Grantslast 30 patents

Information Patent Grant
Loudspeaker diaphragm and manufacturing method thereof
- Patent number 9,838,817
- Issue date Dec 5, 2017
- GoerTek Inc.
- Xiuli Chang
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
LOUDSPEAKER DIAPHRAGM AND MANUFACTURING METHOD THEREOF
- Publication number 20160295329
- Publication date Oct 6, 2016
- Xiuli CHANG
- H04 - ELECTRIC COMMUNICATION TECHNIQUE