Wilhelm Langenfeld

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Dusseldorf, DE

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Patents Grantslast 30 patents

Information Patent Grant
Tap spout for metallurgical vessels and method of repairing
- Patent number 4,984,769
- Issue date Jan 15, 1991
- Didier-Werke AG
- Raimund Bruckner
- C21 - METALLURGY OF IRON
Information Patent Grant
Gas flushing inlet arrangement in a metallurgical vessel and method...
- Patent number 4,522,376
- Issue date Jun 11, 1985
- Didier-Werke AG
- Wilhelm Langenfeld
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Method and device for installing and replacing a gas permeable inse...
- Patent number 4,331,471
- Issue date May 25, 1982
- Didier-Werke AG
- Wilhelm Langenfeld
- C21 - METALLURGY OF IRON