Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4802623 | Concrete cross sleeper system | Jurgen Frenzel | 1989-02-07 |
| 4756476 | Railway switch | Jurgen Frenzel, Norbert Jacoby, Bernd-Joachim Kempa | 1988-07-12 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4802623 | Concrete cross sleeper system | Jurgen Frenzel | 1989-02-07 |
| 4756476 | Railway switch | Jurgen Frenzel, Norbert Jacoby, Bernd-Joachim Kempa | 1988-07-12 |