| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 6 | |
| #2 | United States | 3 | |
| #3 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Packaging and shipping | |
| #2 | Mechanical elements | |
| #3 | Machine tools | |
| #4 | Engines, pumps and turbines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Bertels Josef | 6 |
| #2 | Josef Bertels | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US3506238A | Flow control for flowable mediums | |
| US3202793A | Process and member for joining by welding light metals with steel | |
| GB964743A | Improvements relating to the connection of light metal parts with iron or steel parts by welding | |
| US3198482A | Sliding gate valve sector-type storage tank closure |