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CHANG TZU-CHUNG

Overview
  • Total Patents
    11
  • GoodIP Patent Rank
    220,194
About

CHANG TZU-CHUNG has a total of 11 patent applications. Its first patent ever was published in 2006. It filed its patents most often in United States and United Kingdom. Its main competitors in its focus markets audio-visual technology and mechanical elements are NINGBO TONWEL AUDIO CO LTD, PRONI LUCIO and ROLA CELESTION LTD.

Patent filings in countries

World map showing CHANG TZU-CHUNGs patent filings in countries
# Country Total Patents
#1 United States 10
#2 United Kingdom 1

Patent filings per year

Chart showing CHANG TZU-CHUNGs patent filings per year from 1900 to 2020

Focus industries

Focus technologies

Top inventors

# Name Total Patents
#1 Chang Tzu-Chung 11

Latest patents

Publication Filing date Title
US2017078778A1 Engaging structure for installation of a loudspeaker
US2016142800A1 In-Wall/In-Ceiling Speaker with Grid Assembly
US2015086065A1 Loudspeakers With Double Dampers
US2012275638A1 Sandwich-Type Woofer with Two Sound Wave Propagation Directions and a Magnetic-Looped Device Thereof
US2012275627A1 Sandwich-type Woofer with Two Sound Wave Propagation Directions
US2011317860A1 Assembly structure for speaker system
US2012207333A1 Sound Box
GB201007333D0 Inner spider or damper arrangement for a loudspeaker
US2011110537A1 Light-Powered Loudspeaker System
US2010278370A1 Motor Structure of Loudspeaker
US2007169988A1 Engaging device for speaker cabinet