Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5833277 | Tension-resisting pipe connection and method of making same | Karl Albert Reinert, Frank Osenberg, Horst Dahlemann | 1998-11-10 |
| 5476290 | Plug-in socket joint secured against sliding movement | Karl H. Bergmann, Alain Percebois | 1995-12-19 |
| 5297824 | Spigot-and-socket joint secured against sliding | Erich Imhof, Karl H. Bergmann | 1994-03-29 |
| 4805932 | Joint secured against sliding | Erich Imhof | 1989-02-21 |