Dirk Pietzcker

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D-3500 Kassel, DE

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Patents Grantslast 30 patents

Information Patent Grant
Heat exchanger
- Patent number 4,799,540
- Issue date Jan 24, 1989
- Dirk Pietzcker
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Heat exchanger and a method and apparatus for the manufacture thereof
- Patent number 4,692,979
- Issue date Sep 15, 1987
- Dirk Pietzcker
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...