Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6822205 | Method for producing multilayer metal composite tubes | — | 2004-11-23 |
| 6576180 | Process for the production of corrugated plastic tubes | — | 2003-06-10 |
| 6015282 | Apparatus for the production of corrugated plastic tubes | — | 2000-01-18 |
| 4983347 | Method of producing an internally smooth, externally ribbed tube from extrudable plastic and apparatus for carrying out the method | — | 1991-01-08 |
| 4787598 | Apparatus for the continuous production of pipes with cross-profiled walls | Helmut Grull | 1988-11-29 |