Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5115656 | Method and apparatus for manufacturing medium-walled and thin-walled seamless pipes | Rolf Kümmerling, Manfred Bellmann | 1992-05-26 |
| 4848124 | Making seamless pipes, over 200 mm in diameter | Manfred Bellmann, Wilhelm Nickel, Rolf Kuemmerling | 1989-07-18 |
| 4404832 | Operating a rolling mill working on seamless tubing | Gerd Pfeiffer, Manfred Bellmann, Karl Oberem, Alfred Lampe, Hermann Josef Frentzen | 1983-09-20 |