Roelof Koopman

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Hardenberg, NL

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Patents Grantslast 30 patents

Information Patent Grant
Process and apparatus perforating tubular plastic foil with a laser...
- Patent number 5,108,669
- Issue date Apr 28, 1992
- Wavin B.V.
- Berend J. van Dijk
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Welding sleeve with connecting means having an upper and lower part
- Patent number 4,855,574
- Issue date Aug 8, 1989
- Wavin B.V.
- Bernard Lodder
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL