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US 4,789,007 AGranted
Method of making compound pipes for conveying various fluids and pipe obtained by this method
OwnerJacques L. Cretelinventor
Life of this patent
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Abstract
A method of making a tube for carrying various fluids and materials, the tube comprising from the inside to the outside a layer of impervious plastics material, a first layer of glass fibers connected to the impervious layer, a layer of electrically conducting material and a second layer of glass fibers, the three lastly named layers being impregnated with a resin polymerized through heating of the layer of electrically conducting material which may be a heating metal wire resistor.
Claims1
A tube for carrying any fluid and comprising from the inside towards the outside thereof;
- a layer of impervious plastics material;
- a first tubular layer of continuously circularly woven glass fibers connected to the aforesaid layer;
- a metal wire conductor spirally wound about said first layer;
- a second tubular layer of continuously circularly woven glass fibers about said conductor and said first layer;
- said conductor and said first and second tubular layers being impregnated with resin so as to be connected together with said impervious layer;
- and
- said glass fibers of said first and second tubular layers are orthogonally bound or interlaced in skew relationship or along the grain with respect to a centerline axis of said tube
4 more elements
Dependencies are inferred from the claim text.