| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Sweden | 7 | |
| #2 | EPO (European Patent Office) | 5 | |
| #3 | United States | 5 | |
| #4 | Brazil | 2 | |
| #5 | Canada | 2 | |
| #6 | German Democratic Republic | 2 | |
| #7 | Finland | 2 | |
| #8 | WIPO (World Intellectual Property Organization) | 2 | |
| #9 | Australia | 1 | |
| #10 | Denmark | 1 | |
| #11 | Greece | 1 | |
| #12 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Civil engineering | |
| #4 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Pipes | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Tools for connecting or disengaging | |
| #5 | Sewers | |
| #6 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Westman Stig | 30 |
| #2 | Stig Westman | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US5176413A | Anchoring means for pipes with rhomboid-shaped grip ring | |
| US5056269A | Apparatus for working in pipes | |
| CA1283140C | Pipe connector device | |
| DD243743A5 | Repair bucket for pipes | |
| EP0159300A1 | Repair sleeve for piping | |
| EP0148735A2 | Equipment for closing conduits |