Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6597084 | Ring-shaped piezoelectric transformer having an inner and outer electrode | Jin-Hua Hu, Hing Leung Li, Helan Lai-Wah Chan | 2003-07-22 |
| 6286747 | Ultrasonic transducer | Helen Lai Wa Chan, Siu Wing Or | 2001-09-11 |
| 6190497 | Ultrasonic transducer | Helen Lai Wa Chan, Siu Wing Or, Kei Cheng | 2001-02-20 |