Stephen Wai-Kin Chan

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Hong Kong, HK

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Patents Grantslast 30 patents

Information Patent Grant
Air purifier
- Patent number 6,660,070
- Issue date Dec 9, 2003
- Simatelex Manufactory Co., Ltd.
- Chi Cheung Chung
- F24 - HEATING RANGES VENTILATING

Patents Applicationslast 30 patents

Information Patent Application
Air purifier
- Publication number 20020078830
- Publication date Jun 27, 2002
- Chi-Cheung Chung
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL