Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6741691 | Call-back method for telecommunications and devices adapted accordingly | Rudolf Ritter | 2004-05-25 |
| 6738622 | Roaming method and devices appropriate therefor | Anton Niklaus Stadelmann, Werner Hirzel | 2004-05-18 |