Johann Wassen

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Brackwede, DT

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Patents Grantslast 30 patents

Information Patent Grant
Continuous process for the production of very long precision tubes...
- Patent number 4,006,622
- Issue date Feb 8, 1977
- Mannesmannrohren-Werke AG
- Johann Wassen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Removal of excess metal from the welding seam in the interior of a...
- Patent number 3,963,514
- Issue date Jun 15, 1976
- Mannesmannrohren-Werke AG
- Johann Wassen
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Stretch-forming of long tubes
- Patent number 3,950,978
- Issue date Apr 20, 1976
- Mannesmannrohren-Werke AG
- Johann Wassen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...