Pui Yan Chan

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Causeway Bay, HK

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus, method and system for teaching elapsed time
- Patent number 7,236,430
- Issue date Jun 26, 2007
- World Class Learning Materials, Inc.
- Bruce B. Brown
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Apparatus, method and system for teaching elapsed time
- Patent number 7,121,833
- Issue date Oct 17, 2006
- World Class Learning Materials Inc.
- Bruce B. Brown
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS