Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11697993 | Rotary engine | Han-Chih Chang | 2023-07-11 |
| 7800906 | Electronic device and heat dissipation unit thereof | — | 2010-09-21 |
| 5312082 | Clipboard having a whistle integrally formed therewith | — | 1994-05-17 |
| 5180133 | Clipboard having a calculator mounted thereon | — | 1993-01-19 |
| 4948172 | Combined clip board and pen holder | — | 1990-08-14 |
| 4763389 | Clipboard structure | — | 1988-08-16 |
| 4745662 | Easily assembled clip | — | 1988-05-24 |
| 4628572 | Clip structure | — | 1986-12-16 |
| 4375296 | Clipboard | — | 1983-03-01 |