Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6585299 | Pipe connector | Erich Quadflieg, Gerhard Krug, Martin Schluter | 2003-07-01 |
| 6511102 | Pipe connector | Gerhard Krug, Erich Quadflieg | 2003-01-28 |
| 6155613 | Pipe joint | Erich Quadflieg, Christoph Bunsen, Thomas Gigowski, Martin Schluter | 2000-12-05 |
| 5394823 | Pipeline with threaded pipes and a sleeve connecting the same | — | 1995-03-07 |
| 5275445 | Gas-tight pipe connection | Rainer Krings, Erwin Langer | 1994-01-04 |
| 5048871 | Screwed pipe joint | Gerd Pfeiffer, Erich Quadflieg, Gerhard Krug, Josef Siekmeyer | 1991-09-17 |
| 4955644 | Drill pipe coupling | Gerd Pfeiffer, Erich Quadflieg | 1990-09-11 |
| 4611838 | Fluidtight pipe joint | Wolfgang Heilmann, Gerhard Missaire, Friedrich-Oskar Winter | 1986-09-16 |
| 4595219 | Gas tightly sealed joint in oil field tubular goods | Erwin Jedamzik | 1986-06-17 |
| 4414247 | Method for surface treatment of threading | Hans Hubecker, Gerhard Missaire | 1983-11-08 |