Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7455087 | Electric sharpener for writing instruments | King Biu Mak, Ronald Mak | 2008-11-25 |
| 6898856 | Letter opener | King Biu Mak, Chung Yin Ronald Mak | 2005-05-31 |
| 6637481 | Apparatus for sharpening a writing instrument | King Biu Mak, Chung Yin Ronald Mak | 2003-10-28 |
| 6397480 | Mechanism for sharpening a writing instrument | King Biu Mak, Chung Yin Ronald Mak | 2002-06-04 |
| D457190 | Clip dispenser | King Biu Mak, Chung Yin Ronald Mak | 2002-05-14 |
| D452531 | Clip dispenser | King Biu Mak, Chung Yin Ronald Mak | 2001-12-25 |