| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 7 | |
| #2 | Norway | 6 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Doig Thomas | 5 |
| #2 | Murray Kenneth Alexander | 4 |
| #3 | Hilliard Paul | 2 |
| #4 | Stewart David | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB9018018D0 | Wellhead cut and pull spear | |
| GB9012911D0 | Ball grab spear | |
| GB9003047D0 | Insert type window mill | |
| GB8920607D0 | Metal seal casing patch | |
| GB8920606D0 | Slip type coil tubing overshot | |
| GB8818216D0 | Casing cutter | |
| GB8716040D0 | Underreamer for descaling |