| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Norway | 17 | |
| #2 | Sweden | 7 | |
| #3 | Germany | 6 | |
| #4 | Denmark | 5 | |
| #5 | France | 5 | |
| #6 | Netherlands | 3 | |
| #7 | United States | 3 | |
| #8 | Belgium | 2 | |
| #9 | EPO (European Patent Office) | 2 | |
| #10 | Finland | 2 | |
| #11 | United Kingdom | 2 | |
| #12 | Canada | 1 | |
| #13 | Switzerland | 1 | |
| #14 | Spain | 1 | |
| #15 | Ireland | 1 | |
| #16 | Italy | 1 | |
| #17 | Luxembourg | 1 | |
| #18 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Environmental technology | |
| #3 | Civil engineering |
| # | Name | Total Patents |
|---|---|---|
| #1 | Tronstad K | 9 |
| #2 | Tronstad Knut | 6 |
| #3 | Oftedal Tor Audun | 5 |
| #4 | Soma Morten H | 5 |
| #5 | Lohne Steffen | 4 |
| #6 | Purinton Roger W | 4 |
| #7 | Spencer Shane L | 4 |
| #8 | Appelgren Roy K | 3 |
| #9 | Johnsen Erling | 3 |
| #10 | Tor Audun Oftedal | 2 |
| Publication | Filing date | Title |
|---|---|---|
| EP3535522A1 | Non-bypassable catalyst assisted appliances | |
| DE19610514A1 | Inbuilt fireplace equipment with vertically movable door | |
| DE4345423C2 | Opening system with cover for allowing discharge of smoke from oven | |
| DE4319956A1 | Connection piece for flue gas pipes | |
| DE3117290A1 | IMPROVED OVEN | |
| EP0025424A1 | Improvement in a stove | |
| DE2747781A1 | DEVICE FOR AN OPEN FIREPLACE | |
| US4030475A | Fireplace |