Jan Willemsen

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Lisse, NL

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Patents Grantslast 30 patents

Information Patent Grant
Rotatable drum drive
- Patent number 4,317,291
- Issue date Mar 2, 1982
- Expert N.V.
- Marinus H. Weststrate
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Device for cooling castings and for treating moulding sand
- Patent number 4,154,290
- Issue date May 15, 1979
- Expert N.V.
- Marinus H. Weststrate
- B22 - CASTING POWDER METALLURGY