Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5222173 | Electro-optical overhead wire with at least 24 light wave guides | — | 1993-06-22 |
| 4421497 | Fiber-reinforced drive shaft | Helmut Federmann | 1983-12-20 |
| 4380443 | Fiber-reinforced drive shaft | Helmut Federmann | 1983-04-19 |
| 4358284 | Fiber-reinforced driveshaft | Helmut Federmann | 1982-11-09 |