Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7413593 | Polarity reversing circuit for electrostatic precipitator systems | Ralph F. Altman, Grady B. Nichols | 2008-08-19 |
| 7101422 | Polarity reversing circuit for electrostatic precipitator systems | Ralph F. Altman, Grady B. Nichols | 2006-09-05 |
| 7081152 | ESP performance optimization control | Ralph F. Altman | 2006-07-25 |
| 7001447 | Polarity reversing circuit for electrostatic precipitator system | Ralph F. Altman, Grady B. Nichols | 2006-02-21 |
| 4772998 | Electrostatic precipitator voltage controller having improved electrical characteristics | Hardey Singh | 1988-09-20 |