Top Inventors at Portasilo Limited All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Richard Leach Tagg | 4 |
| 2 | Brian Parkinson | 1 |
| 3 | John K. Pethullis | 1 |
| #4 | Angus J. Bishop | 1 |
| Rank | Name | Patents |
|---|---|---|
| 1 | Richard Leach Tagg | 4 |
| 2 | Brian Parkinson | 1 |
| 3 | John K. Pethullis | 1 |
| #4 | Angus J. Bishop | 1 |