Ching Wah Shum

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Vancouver, CA

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Patents Grantslast 30 patents

Information Patent Grant
Gapped ground safety device
- Patent number 7,256,978
- Issue date Aug 14, 2007
- British Columbia Hydro and Power Authority
- Terence Donald Deines
- H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

Information Patent Application
Gapped ground safety device
- Publication number 20040169970
- Publication date Sep 2, 2004
- British Columbia Hydro and Power Authority
- Terence Donald Deines
- H01 - BASIC ELECTRIC ELEMENTS