Patent ID: 6161719
Filing Date: 2000-12-19
Classification: E04H,Y10S,Y10T

Abstract:
A liquid storage tank comprising:a floor having a hole formed therein, said hole having a size suitable for allowing a human body to extend therethrough;a first side affixed to a first edge of said floor;a second side affixed to a second edge of said floor;a first end affixed between said first and second sides and to a third edge of said floor;a second end affixed between said first and second sides and to a fourth edge of said floor;a lid affixed to an edge of said first and second sides and said first and second ends opposite said floor; anda cover affixed so as to have a surface overlying entirely over said hole of said floor, said cover positioned between said floor and said lid, said floor and said first and second sides and said first and second ends and said lid being formed of polymeric material, each seam between said lid and said first and second ends and said first and second sides is welded internally and each seam between said floor and said first and second ends and said first and second sides is welded internally, said cover having a seam with said floor welded solely externally.