Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6904687 | Extended reach tree maintenance apparatus | — | 2005-06-14 |
| 4906313 | Fusion weld method and assembly for forming a fusion welded joint between pipe sections | — | 1990-03-06 |
| 4718698 | Apparatus and method of forming fusion welded butt joint between thermoplastic pipe sections | — | 1988-01-12 |
| 4386796 | Pipe repair coupling | Robert W. Lyall | 1983-06-07 |
| 4257452 | Biased open direct response valve with damping means | Robert W. Lyall | 1981-03-24 |
| 4243254 | Slip fit type tubing coupling | Robert W. Lyall | 1981-01-06 |