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Fiber reinforced sandwich tube
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Patent number 4,080,999
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Issue date Mar 28, 1978
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Industriele Onderneming Wavin N.V.
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Hein Bulters
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Connections for insulated pipes
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Patent number 3,992,237
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Issue date Nov 16, 1976
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Industriele Onderneming Wavin N.V.
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Willem Gerholt
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Method for forming a plastic pipe
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Patent number 3,991,150
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Issue date Nov 9, 1976
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Industriele Onderneming Wavin N.V.
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Warner Jan De Putter
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Method for manufacturing a plastic tube
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Patent number 3,959,427
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Issue date May 25, 1976
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Industriele Onderneming Wavin N.V.
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Cornelis Van Zon
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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