Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4539503 | Rapid-heating, high-temperature-stable spark plug for internal combustion engines | Friedrich Esper, Karl-Hermann Friese, Peter Sternad | 1985-09-03 |
| 4535487 | Endoprosthesis shaft | Friedrich Esper | 1985-08-20 |
| 4356571 | Prosthetic device | Friedrich Esper | 1982-11-02 |