| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 4 | |
| #2 | Spain | 4 | |
| #3 | Denmark | 2 | |
| #4 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Basic materials chemistry |
| # | Technology | |
|---|---|---|
| #1 | Producer gas production | |
| #2 | Gas, coke and tar production |
| # | Name | Total Patents |
|---|---|---|
| #1 | Karl Bergfeld | 4 |
| #2 | Bergfeld Karl | 3 |
| Publication | Filing date | Title |
|---|---|---|
| ES155379A1 | Device for drying ashes and gasogen or similar scrapes, especially for automobiles and small industry | |
| ES155381A1 | A gasogen | |
| ES155380A1 | Well oven, especially for dry distillation, with central introduction of washing gas | |
| ES154256A1 | Procedure for the manufacture of poor gas and especially of water gas, through a lamination gas current | |
| CA306184A | Gas pressure regulator |