Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8978961 | Method for producing connecting elements by way of a pressure welding process and connecting element | Jörn Grotherr, Christian Hoffmann, Heiko Junge | 2015-03-17 |
| 8596344 | Handling device for pipes | Jörn Grotherr, Tomoya Inoue, Eiichi Higashi | 2013-12-03 |
| 8079627 | Device for vertically holding pipes | Jörn Grotherr, Ronaldus R. M. Rölling, Iwo Severin | 2011-12-20 |
| 7510033 | Apparatus for vertically supporting pipes | Jörn Grotherr | 2009-03-31 |
| 5755289 | Drilling rig elevator with replaceable clamping inserts and method for installation | Per Angman, Hans-Jurgen Ulbrich | 1998-05-26 |