| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 3 | |
| #2 | Belgium | 2 | |
| #3 | Canada | 2 | |
| #4 | Finland | 2 | |
| #5 | Norway | 2 | |
| #6 | Sweden | 2 | |
| #7 | United States | 2 | |
| #8 | Germany | 1 | |
| #9 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Pipes | |
| #2 | Unspecified technologies | |
| #3 | Testing of structures | |
| #4 | Pipe-line systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Blom Hans | 14 |
| #2 | Wiberg Leif | 13 |
| Publication | Filing date | Title |
|---|---|---|
| CA1143671A | District-heating line | |
| CA1143670A | District-heating line and a method of manufacturing the same |