Top Inventors at Petroleum Engineering Services Limited All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Drummond Whiteford | 2 |
| 2 | Irvine Cardno Brown | 2 |
| 3 | Richard P. Rubbo | 2 |
| #4 | Brett W. Bouldin | 1 |
| #5 | George Maitland | 1 |
| #6 | James Crabb | 1 |
| #7 | Stuart Brown | 1 |
| #8 | Stephen Reid | 1 |
| #9 | Sydney Joseph Littleford | 1 |