Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4781402 | Metal chimney assembly | David M. Fetters | 1988-11-01 |
| 4720125 | Expansion and length adjustment joint | William J. Blalock | 1988-01-19 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4781402 | Metal chimney assembly | David M. Fetters | 1988-11-01 |
| 4720125 | Expansion and length adjustment joint | William J. Blalock | 1988-01-19 |