Allan Chi-Yun Wong

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Kowloon, HK

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Patents Grantslast 30 patents

Information Patent Grant
Intercom/wireless door bell for multi-handset telephone system
- Patent number 7,738,917
- Issue date Jun 15, 2010
- VTech Telecommunications Limited
- Gordon Ryley
- G08 - SIGNALLING
Information Patent Grant
Wireless multi-handset telephone system with integrated video monit...
- Patent number 7,062,291
- Issue date Jun 13, 2006
- VTech Telecommunications Limited
- Gordon Ryley
- H04 - ELECTRIC COMMUNICATION TECHNIQUE