| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 15 | |
| #2 | United Kingdom | 2 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Thermal processes | |
| #3 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Cleaning heat-exchanger internal surfaces | |
| #3 | Water treatment | |
| #4 | Heat-exchange device details | |
| #5 | Chemical or physical processes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Engisch Otto | 2 |
| #2 | Otto Engisch | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB446739A | Improvements in or relating to evaporators with internal rotary heating members | |
| US1918385A | Evaporator | |
| GB344125A | Improvements in or relating to evaporators |