Sealing of pipe liners

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12251887
APP PUB NO 20220186871A1
SERIAL NO

17441296

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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The present invention provides a method and apparatus of manufacturing a pipe liner for lining the inside of a pipe, for example a water or sewerage pipe requiring repair. The pipe liner is mainly formed of a fabric sleeve, or a plurality of fabric sleeves, and comprises a fluid-proof barrier coating on the inside surface of the pipe liner. The method involves arranging a strip of carrier material comprising a liquid sealant inside the fabric sleeve of the pipe liner and in registration with two opposing side edges of the sheet of fabric, facing an inner barrier coating of the fabric sleeve. The method can advantageously provide such a pipe liner with an inner barrier coating without everting the pipe liner after manufacture. The present invention may provide for avoiding internal cross-welding of pipe liners and a method for testing the integrity of the barrier coating of pipe liners.

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Patent Owner(s)

  • W.E.RAWSON LIMITED

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Blades, David John Wakefield, GB 2 4
Johnson, Alexander Charles Edward Wakefield, GB 3 20

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