Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4626262 | Exhaust air system for electrostatic air cleaner | — | 1986-12-02 |
| 4306230 | Self-checking photoelectric smoke detector | Stephen A. Haglund | 1981-12-15 |
| 4230950 | Electro-optic smoke detector | Tzuo-Chang Lee | 1980-10-28 |