Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D438235 | Calculator | William H. K. Chu | 2001-02-27 |
| D437351 | Calculator with perpetual calendar | William H. K. Chu | 2001-02-06 |
| D436992 | Alarm with perpetual calendar suitable for traveler | William H. K. Chu | 2001-01-30 |