Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4303251 | Flange sealing joint with removable metal gasket | David J. Harra | 1981-12-01 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4303251 | Flange sealing joint with removable metal gasket | David J. Harra | 1981-12-01 |