Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5631818 | Power supply for electrostatic preciptator electrodes | Nathaniel M. Johnson, Carl F. Butler, deceased | 1997-05-20 |
| 5629842 | Two-stage, high voltage inductor | Nathaniel M. Johnson | 1997-05-13 |