Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5228186 | Method of manufacturing electro-fusion fittings | David A. Brettell, Russell J. Kirk, David M. A. Kenworthy | 1993-07-20 |
| 5163713 | Electro-fusion fittings | David A. Brettell, Russell J. Kirk, David M. A. Kenworthy | 1992-11-17 |