Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876147 | Cable insulation based on ethylene polymers having high resistance to the formation of water trees | Johannes Schlag, Ernst Koehnlein, Ludwig Koessler, Alfred F. Hausz | 1989-10-24 |
| 4853951 | Cordless telephone with in-range monitoring | — | 1989-08-01 |