초록 ▼

A device for providing a moisture impervient barrier, comprises a flexible base sheet member having a layer of bentonite resting on its upper surface. A top sheet member is positioned over the bentonite and is secured to the base member by stitches extending therebetween. The stitches form either a

A device for providing a moisture impervient barrier, comprises a flexible base sheet member having a layer of bentonite resting on its upper surface. A top sheet member is positioned over the bentonite and is secured to the base member by stitches extending therebetween. The stitches form either a quilting pattern or in the alternative, they can form elongated corrugated compartments filled with bentonite which will swell and break the top sheet member when exposed to water.

대표청구항 ▼

A device for providing a moisture impervient barrier comprising: a flexible base sheet member having an upper surface, a lower surface and a longitudinal axis, said base sheet member being comprised of a material which is gas permeable in any direction within the plane defined by said base sheet mem

A device for providing a moisture impervient barrier comprising: a flexible base sheet member having an upper surface, a lower surface and a longitudinal axis, said base sheet member being comprised of a material which is gas permeable in any direction within the plane defined by said base sheet member so as to permit gases to escape through said base sheet member; a layer of water swellable bentonite resting on said base sheet member, said bentonite layer having a constant thickness; an elongated flexible top sheet member resting upon the top of said layer of bentonite; securing means comprising a plurality of thread stitches extending through said base sheet member, said bentonite, and said top sheet member at a plurality of locations for securing the same together, said stitches spanning the distance between said base sheet member and said top sheet member so as to maintain a substantially uniform thickness for said bentonite layer; said stitches dividing said spaced apart base and top sheet members into a quilted pattern forming a plurality of four sided compartments, each of said compartments containing a portion of bentonite.