Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4580443 | Detecting leaks | Francis R. Piper, David J. Bray, John F. Wilson | 1986-04-08 |
| 4577489 | Detecting leaks | Francis R. Piper, John F. Wilson | 1986-03-25 |
| 4577490 | Detecting leaks | David J. Bray, Peter E. Johnson, Francis R. Piper, Iain H. Murdoch | 1986-03-25 |
| 4477986 | Method of, and apparatus for, detecting leaks | Francis R. Piper, John F. Wilson | 1984-10-23 |
| 4278350 | Hub alignment | Michael Rawle | 1981-07-14 |