Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4732623 | Method of making high strength steel tube | Heinz Gross, Friedhelm Retzlaff, Karl H. Schlusnus | 1988-03-22 |
| 4414042 | Method of making high strength steel tube | Heinz Gross, Friedhelm Retzlaff, Karl H. Schlusnus | 1983-11-08 |