Pui Hang Yuen

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Shatin, HK

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Patents Applicationslast 30 patents

Information Patent Application
Dimmable thermally controlled safety light emitting diode illuminat...
- Publication number 20110285308
- Publication date Nov 24, 2011
- Bonnie A. Crystal
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Application
High efficiency low cost safety light emitting diode illumination d...
- Publication number 20110128742
- Publication date Jun 2, 2011
- Pui Hang Yuen
- F21 - LIGHTING
Information Patent Application
High efficiency low cost safety light emitting diode illumination d...
- Publication number 20090175041
- Publication date Jul 9, 2009
- Pui Hang Yuen
- F21 - LIGHTING