Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5158389 | Hollow section for coupling with other sections | Klaus-Georg Bottger | 1992-10-27 |
| 4698896 | Method of applying hollow section coupling to other sections | Klaus-Georg Bottger, Rudolf Kader | 1987-10-13 |