Showing 1–17 of 17 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Stewart T. Leslie | Euro-Celtique S.A. | 4 |
| 2 | Gregory E. Hennig | Baker Hughes Holdings | 2 |
| 2 | Neil Andrew Abercrombie Simpson | Weatherford/Lamb | 2 |
| #4 | Trevor W. J. Park | Abb Vetco Gray | 1 |
| #4 | Kathryn Armour | The Dow Chemical | 1 |
| #4 | Allan Sharp | Abb Vetco Gray | 1 |
| #4 | George Telfer | Specialised Petroleum Services Group Limited | 1 |
| #4 | Neil Andrew Robert Gow | Krone | 1 |
| #4 | Robert Whyte | — | 1 |
| #4 | George L. Souter | Alfa Laval Separation A/S | 1 |
| #4 | Edward Charles Small | Arjo Wiggins Fine Papers Limited | 1 |
| #4 | Ian David Farquhar Davidson | Scotoil Group Plc | 1 |
| #4 | Andrew Philip Churchill | Churchill Drilling Tools Limited | 1 |
| #4 | Iain MacPherson Oswald | Abb Vetco Gray | 1 |
| #4 | Robert Meiklem Yuill | Unknown | 1 |
| #4 | Anthony E. Ellis | — | 1 |
| #4 | Carlo Leifert | — | 1 |