| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 7 | |
| #2 | United States | 3 | |
| #3 | Norway | 2 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Pipes | |
| #3 | Unspecified technologies | |
| #4 | Venting or aerating devices | |
| #5 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kirkman Douglas Frederick | 4 |
| #2 | Kirkman Douglas F | 3 |
| #3 | Kirkman Frederick | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB9904367D0 | Sub-sea solenoid pilot valve | |
| GB9826322D0 | Directional control valves | |
| GB9819529D0 | Pressure balanced couplings | |
| GB9720724D0 | Pressure balanced couplings | |
| GB9606133D0 | Sub-sea coupling with conical seal | |
| GB9403207D0 | Breakaway stab plate connection |