Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4475013 | Repertory automatic telephone dialing apparatus wherein a name and telephone number are searched by depressing one or more letter code keys | Yue Cheng | 1984-10-02 |
| 4383253 | Ionization smoke detector | Hau C. Lam | 1983-05-10 |
| 4287513 | Door knob alarm device | Hau C. Lam, Y. Cheng | 1981-09-01 |
| 4258358 | Door opening sensing and alarm producing device | Hau C. Lam | 1981-03-24 |