Norbert Langenfeld

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Cologne, DE

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Patents Grantslast 30 patents

Information Patent Grant
Acid halides, a process for their preparation
- Patent number 4,880,576
- Issue date Nov 14, 1989
- Bayer Aktiengesellschaft
- Heinz U. Blank
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the production of aromatic isocyanates containing aroma...
- Patent number 4,359,426
- Issue date Nov 16, 1982
- Bayer Aktiengesellschaft
- Dieter Dieterich
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of aromatic sulphonic acid halides
- Patent number 4,349,471
- Issue date Sep 14, 1982
- Bayer Aktiengesellschaft
- Heinz U. Blank
- C07 - ORGANIC CHEMISTRY