Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6755747 | Method of manufacturing an expansion sleeve | Claudia Zimmerer, Heinz Bisping, Alois Koelbl, Erich Daigeler | 2004-06-29 |
| 6712572 | Expansion dowel | Heinz Bisping, Alois Kolbl, Claudia Zimmerer | 2004-03-30 |
| 6454506 | Anchor bolt with an outer thread having thread turns with different cross-sectional shape | Kai-Uwe Keller, Marcel John | 2002-09-24 |
| 6450745 | Dowel with a weakened section adjoining the leading threaded end thereof | — | 2002-09-17 |
| 6428256 | Attachment element for an anchor rod | — | 2002-08-06 |