| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Australia | 2 | |
| #3 | Canada | 2 | |
| #4 | Germany | 2 | |
| #5 | United Kingdom | 2 | |
| #6 | Italy | 2 | |
| #7 | Norway | 2 | |
| #8 | Belgium | 1 | |
| #9 | Brazil | 1 | |
| #10 | France | 1 | |
| #11 | Japan | 1 | |
| #12 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Pipes | |
| #3 | Hydraulic engineering | |
| #4 | Measuring length, angles and areas |
| # | Name | Total Patents |
|---|---|---|
| #1 | Blaby Roy Edward | 3 |
| #2 | Bergquist Arthur John | 3 |
| #3 | Dejong Jan | 3 |
| #4 | Hopkins John Wentworth | 3 |
| #5 | Dejong J | 2 |
| #6 | Hopkins John W | 2 |
| #7 | Feller Murray D | 1 |
| #8 | Bergquist Arthur J | 1 |
| #9 | Hopkins J W | 1 |
| #10 | Jong Jan De | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4141147A | Pup measurement gauge | |
| US4153113A | Subsea drill-thru manifold center | |
| US3967462A | Method and apparatus for joining a subsea pipeline to an offshore platform riser | |
| US3795115A | Method and apparatus for joining subsea pipelines |