Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5140791 | Limited access feeder raceway | — | 1992-08-25 |
| 4931597 | Junction boxes | Donald L. Chapman | 1990-06-05 |
| 4899506 | Large capacity electrical service fitting for concrete floors | Donald L. Chapman | 1990-02-13 |