| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 5 | |
| #2 | United States | 5 | |
| #3 | Australia | 4 | |
| #4 | South Africa | 4 | |
| #5 | United Kingdom | 3 | |
| #6 | Brazil | 1 | |
| #7 | Germany | 1 | |
| #8 | Denmark | 1 | |
| #9 | EPO (European Patent Office) | 1 | |
| #10 | Finland | 1 | |
| #11 | France | 1 | |
| #12 | India | 1 | |
| #13 | Norway | 1 | |
| #14 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Pipes | |
| #4 | Metal-working |
| # | Name | Total Patents |
|---|---|---|
| #1 | Becker Floyd W | 13 |
| #2 | Regimbal Richard R | 8 |
| #3 | Becker F | 6 |
| #4 | Becker F W | 4 |
| #5 | Becker Floyd Walter | 3 |
| #6 | Regimbal R | 2 |
| Publication | Filing date | Title |
|---|---|---|
| CA1240664A | Pipe handling apparatus | |
| US4337563A | Method of assembling multiple wall drill pipe | |
| US4371041A | Multi-purpose mobile drill rig | |
| US4274663A | Multiple wall drill pipe | |
| AU2553677A | Double walled pipe construction | |
| GB1559437A | Drill pipes | |
| ZA7702963B | Double-walled pipe construction | |
| CA1034937A | Double-walled pipe construction | |
| US3889927A | Apparatus for pulling drill pipe |