Top Inventors at Petrowell Limited All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Daniel George Purkis | 20 |
| 2 | Iain MacLeod | 6 |
| 3 | Steve Reid | 4 |
| #4 | Colin Smith | 3 |
| #5 | Damien Patton | 3 |
| #6 | Lee Mercer | 3 |
| #7 | Andrew John Elrick | 3 |
| #8 | Iain McLeod | 2 |
| #9 | Matthew Manning | 2 |
| #10 | Oliver Webster | 2 |
| #11 | Stephen Reid | 2 |
| #12 | Atul B. Sood | 1 |
| #13 | Davidson Harman | 1 |
| #14 | David Jenner | 1 |
| #15 | Frazer Geddes | 1 |
| #16 | Gilbert Alexander Anderson | 1 |
| #17 | Hugh Clarkson | 1 |
| #18 | Ian Duncan | 1 |
| #19 | Ian Jaffrey | 1 |
| #20 | Niall Lipp | 1 |
| #21 | Philip CG Egleton | 1 |
| #22 | Richard Atkinson | 1 |
| #23 | Santiago Galvez Porta | 1 |
| #24 | Stewart Christie | 1 |
| #25 | Steve Corbett | 1 |
| #26 | Steven J. Reid | 1 |
| #27 | Alan Craigon | 1 |