초록 ▼

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 fi

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.

대표청구항 ▼

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 sec

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