| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 12 | |
| #2 | United Kingdom | 3 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Mechanical elements | |
| #3 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Analysing materials | |
| #2 | Smoking accessories | |
| #3 | Venting or aerating devices | |
| #4 | Testing of structures |
| # | Name | Total Patents |
|---|---|---|
| #1 | Sewerin Paul | 2 |
| #2 | Sewerin Peter | 1 |
| #3 | Sewerin Hermann | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1301021A | Flame ionisation apparatus for gas detection | |
| GB492428A | Improvements in or relating to apparatus for indicating the presence of gases | |
| GB493094A | Improvements in or relating to apparatus for indicating the presence of gases |