Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491535 | Electrical distribution system with keyed channel arrangement | — | 2002-12-10 |
| 6329591 | Wall panel assembly | Ronald E. Karst, Edward J. Keil, Donald E. DeWitt | 2001-12-11 |
| 6235988 | Wall panel assembly | Ronald E. Karst, Edward J. Keil, Donald E. DeWitt | 2001-05-22 |