| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Argentina | 1 | |
| #2 | Bulgaria | 1 | |
| #3 | Czechia | 1 | |
| #4 | EAPO (Eurasian Patent Organization) | 1 | |
| #5 | Estonia | 1 | |
| #6 | EPO (European Patent Office) | 1 | |
| #7 | Hong Kong | 1 | |
| #8 | Croatia | 1 | |
| #9 | Slovakia | 1 | |
| #10 | Ukraine | 1 | |
| #11 | Yugoslavia (Serbia and Montenegro) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Medical technology | |
| #2 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Object sterilising | |
| #2 | Air-conditioning |
| # | Name | Total Patents |
|---|---|---|
| #1 | Prahl Helmut | 10 |
| #2 | Petz Guenter | 6 |
| #3 | Petz Gunter | 4 |
| Publication | Filing date | Title |
|---|---|---|
| BG107644A | Device for regenerating air in an enclosed space | |
| UA76120C2 | Appliance for regenatating air in premises | |
| YU20103A | Device for regenerating air in an enclosed space |