Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8539673 | Method and device for machining a sealing seat of a shut-off valve | Karl-Heinz Herzing, Josef Sprehe, Volker Wurzer | 2013-09-24 |
| 8217295 | Method for producing a welded connection for use in a corrosive environment | Erhard Brückner, Gerhard Engelhard | 2012-07-10 |
| 4757935 | Method and device for flushing the inside surface of a pipe in the vicinity of a welded seam | — | 1988-07-19 |
| 4698474 | Welding tongs for connecting two abutting pipe ends by arc welding | Dieter Pellkofer, Siegfried Forner | 1987-10-06 |