Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7895233 | Selectively searching restricted documents | Achim Weigel, Hans-Juergen Richstein | 2011-02-22 |
| 7707506 | Breadcrumb with alternative restriction traversal | Achim Weigel, Hans-Juergen Richstein | 2010-04-27 |
| 6859777 | Hypertext navigation system controlled by spoken words | — | 2005-02-22 |
| 6029135 | Hypertext navigation system controlled by spoken words | — | 2000-02-22 |