Friedhelm Retzlaff

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Kamen-Methler, DE

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for continuous production of tubular bodies by...
- Patent number 4,827,099
- Issue date May 2, 1989
- Hoesch Aktiengesellschaft
- Rolf Krebs
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method of making high strength steel tube
- Patent number 4,732,623
- Issue date Mar 22, 1988
- Hoesch Werke Aktiengesellschaft
- Heinz Gross
- C21 - METALLURGY OF IRON
Information Patent Grant
Use of the laser welding process for and method of manufacturing of...
- Patent number 4,656,332
- Issue date Apr 7, 1987
- Hoesch Aktiengesellschaft
- Heinz Gross
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method of making high strength steel tube
- Patent number 4,414,042
- Issue date Nov 8, 1983
- Hoesch Werke Aktiengesellschaft
- Heinz Gross
- C21 - METALLURGY OF IRON