Jan A. de Graaf

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Heemskerk, NL

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Patents Grantslast 30 patents

Information Patent Grant
Metallurgical vessel having an opening and a flange around the opening
- Patent number 4,569,508
- Issue date Feb 11, 1986
- Hoogovens Groep B.V.
- Jan A. de Graaf
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Slag shield for a steel converter
- Patent number 4,149,706
- Issue date Apr 17, 1979
- Hoogovens Ijmuiden, B.V.
- Jan A. de Graaf
- C21 - METALLURGY OF IRON