Kwok Pun Cheung

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Hong Kong SAR, HK

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Patents Grantslast 30 patents

Information Patent Grant
Universal heliodon-sundial
- Patent number 6,523,270
- Issue date Feb 25, 2003
- University of Hong Kong
- Kwok Pun Cheung
- G04 - HOROLOGY
Information Patent Grant
Universal solar chart shadow plotter and method for plotting a shadow
- Patent number 6,449,854
- Issue date Sep 17, 2002
- University of Hong Kong
- Kwok Pun Cheung
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS