Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883954 | Method of measuring optical radiation energy reflected by a reflection area | Hildegard Esser | 1989-11-28 |
| 4877302 | Plug connector for the ends of two light waveguides | Erich Schurmann | 1989-10-31 |
| 4869571 | Plug pin for a light waveguide | Horst Hubner | 1989-09-26 |