| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 9 | |
| #2 | Italy | 5 | |
| #3 | Spain | 3 | |
| #4 | United Kingdom | 3 | |
| #5 | Canada | 2 | |
| #6 | Sweden | 2 | |
| #7 | United States | 2 | |
| #8 | Belgium | 1 | |
| #9 | EPO (European Patent Office) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Thermal processes | |
| #3 | Civil engineering | |
| #4 | Mechanical elements | |
| #5 | Furniture and games | |
| #6 | Transport |
| # | Name | Total Patents |
|---|---|---|
| #1 | Durst Felix | 7 |
| #2 | Duerst Felix | 1 |
| Publication | Filing date | Title |
|---|---|---|
| EP0136612A2 | Heat exchanger of plastics material | |
| FR2326673A1 | Solar energy absorber heat exchanger - is manufactured from two similarly-dimpled plastics sheets stuck together with space between | |
| CA942091A | Tamping machine for setting floor covering tiles | |
| US3643277A | Device for cleaning venetian blind slats | |
| GB1029587A | Container | |
| GB879701A | Improvements in means for transporting mortar, sand and the like | |
| CA902460A | Device for cleaning venetian blind slats |