| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 3 | |
| #2 | Spain | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Basic materials chemistry | |
| #3 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Furnaces | |
| #2 | Gas, coke and tar production | |
| #3 | Mixing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Zelewski Roman Von | 9 |
| Publication | Filing date | Title |
|---|---|---|
| GB191312120A | An Improved Device for use in Charging and Discharging Retorts, Muffles and the like. | |
| US915531A | Mechanical roasting-furnace. | |
| GB190721961A | Improvement in or relating to "Mechanical Roasting-furnace". | |
| US882730A | Mechanical roasting-furnace. | |
| US741430A | Roasting-furnace with a swimming hearth. |