Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4440553 | Air-filtration module with ionization for elimination of static electricity | Martin C. Helmus | 1984-04-03 |
| 4333750 | Filtration module with included illumination | Martin C. Helmus | 1982-06-08 |