Kei-Fung Choi

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Chai Wan, HK

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Patents Grantslast 30 patents

Information Patent Grant
Toy building construction kit
- Patent number 5,975,977
- Issue date Nov 2, 1999
- Silverlit Technology Ltd
- Kei-Fung Choi
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Toy building system
- Patent number 5,681,201
- Issue date Oct 28, 1997
- Silverlit Technology Ltd.
- Kei-Fung Choi
- A63 - SPORTS GAMES AMUSEMENTS