Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5296019 | Dust precipitation from air by negative ionization | Reginald R. Robertson | 1994-03-22 |
| 5141529 | Dust precipitation from air by negative ionization | Reginald R. Robertson | 1992-08-25 |