| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 1 | |
| #2 | Canada | 1 | |
| #3 | Switzerland | 1 | |
| #4 | Denmark | 1 | |
| #5 | EPO (European Patent Office) | 1 | |
| #6 | Finland | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | Ireland | 1 | |
| #9 | Italy | 1 | |
| #10 | Netherlands | 1 | |
| #11 | Norway | 1 | |
| #12 | United States | 1 | |
| #13 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Thermal processes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lemmeke Leif | 10 |
| #2 | Leif Lemmeke | 1 |
| Publication | Filing date | Title |
|---|---|---|
| IE830012L | Device using natural water as a heat source | |
| IT8224792D0 | Ground or surface water heat utilisation | |
| CA1193500A | Method for combined utilization of heat-conveying media such as ground water or the like as a heat source |