| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 5 | |
| #2 | Netherlands | 4 | |
| #3 | Germany | 3 | |
| #4 | Yugoslavia (Serbia and Montenegro) | 3 | |
| #5 | Sweden | 2 | |
| #6 | United States | 2 | |
| #7 | Australia | 1 | |
| #8 | Belgium | 1 | |
| #9 | Canada | 1 | |
| #10 | France | 1 | |
| #11 | United Kingdom | 1 | |
| #12 | Ireland | 1 | |
| #13 | Italy | 1 | |
| #14 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Thermal processes | |
| #3 | Machines | |
| #4 | Electrical machinery and energy | |
| #5 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Domestic heating systems | |
| #2 | Venting or aerating devices | |
| #3 | Pipes | |
| #4 | Heat-exchange device details | |
| #5 | Unspecified technologies | |
| #6 | Installation of electric cables | |
| #7 | Fluid heaters | |
| #8 | Nails | |
| #9 | Unspecified technologies | |
| #10 | Transport or storage devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Roffelsen F | 6 |
| #2 | Roffelsen Franciscus | 5 |
| #3 | Furanshisukasu Rotsufuerusen | 4 |
| #4 | Furankisukusu Rotsufueruzen | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NL7804643A | Breathering device for a closed piping system. | |
| AU3513178A | Dearating closed water circulating systems | |
| US4027691A | Device for venting and aerating closed circulatory water flow systems | |
| YU2973A | Device for ventilating pipeline systems with a closed water stream | |
| CA991503A | Device for venting closed water circulation systems | |
| DE2260349A1 | Water/aerator/de aerator - for closed circulation systems | |
| DE2142026A1 | Mixer/discharger appts - for powdered and granular material |