| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | United States | 4 | |
| #3 | Switzerland | 3 | |
| #4 | France | 3 | |
| #5 | EPO (European Patent Office) | 1 | |
| #6 | Sweden | 1 |
| # | Name | Total Patents |
|---|---|---|
| #1 | Grau Hermann | 7 |
| #2 | Franke Horst Prof Dipl-Ing | 1 |
| #3 | Hermann Grau | 1 |
| #4 | Mueller Jonas | 1 |
| #5 | Spindler Wolfgang | 1 |
| #6 | Strobel Peter Ing-Grad | 1 |
| #7 | Seibold Alexander | 1 |
| #8 | Peterich Frank-Norbert Dipl In | 1 |
| #9 | Engelhardt Achim Dr Med | 1 |
| #10 | Engelhardt Achim Dr | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE3231854A1 | Eroding voltage analyser for a spark-erosion machine | |
| DE2925225A1 | HAND PROSTHESIS | |
| US3926326A | Safety closure | |
| US3944102A | Safety screw closure | |
| DE534227C | Limit switch for electrically operated machines |