Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8766689 | Phase-frequency detection method | — | 2014-07-01 |
| 7937804 | Belt lifter mechanism for vacuum cleaner | Chris Charlton, Ng Wing Leung | 2011-05-10 |
| 5025817 | Structure of spherical vanity case | — | 1991-06-25 |