Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9381554 | Method for producing seamless hot-rolled pipes in continuous pipe rolling mills | Rolf Kümmerling, Gerd Homberg, Frank Hagemann, Gabriel Pereira, Winfried Braun | 2016-07-05 |
| 8166792 | Method of making a seamless hot-finished steel pipe, and device for carrying out the method | Rolf Kümmerling, Stefan Wiedenmaier, Pierre Lefebvre, Rupert Wieser, Robert Koppensteiner | 2012-05-01 |
| 5256219 | Steel reinforcement tube | Ingo von Hagen, Enno Wieting | 1993-10-26 |
| 5232740 | Method of manufacturing plated hollow blocks | Ingo von Hagen, Fritz-Peter Pleschiutschnigg, Lothar Parschat | 1993-08-03 |
| 5019180 | Method of manufacturing of high-strength seamless steel tubes | Ingo von Hagen, Gerd Homberg | 1991-05-28 |
| 4900376 | Hardening a cylindrical hollow object preferably made of steel | Ingo von Hagen, Wilhelm Nickel | 1990-02-13 |