Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823847 | Multi-layer helical seam steel pipe | Heinz Grosse, Friedrich-Otto Koch, Adolf Peeck | 1989-04-25 |
| 4721536 | Method for making steel tubes or pipes of increased acidic gas resistance | Heinz Grob, Friedrich-Otto Koch, Adolf Peeck | 1988-01-26 |
| 4688319 | Multi-layer helical seam steel pipe | Heinz Gross, Friedrich-Otto Koch, Adolf Peeck | 1987-08-25 |
| 4247033 | Method of and device for producing multi-layer pipes | Karl Dahmen, Jurgen Engel, Heinz Gross, Martin Henning | 1981-01-27 |