Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4993621 | Method of protecting corrosion-susceptible walls against corrosion | Hermann Koy | 1991-02-19 |
| 4948399 | Corona electrode for dust-collecting electrostatic precipitator | Hermann Koy | 1990-08-14 |