Abstract: A sloped bottom portable tank having a smooth internal bottom surface sloping toward a bottom discharge comprising a rectangular bottom plate having upturned curved side portions merging with upwardly extending wall portions joining the vertical walls of the tank along a horizontal edge. The tank has integral feet at the corners to position the discharge at the lowest point when the tank is vertical and resting on a horizontal surface.

Abstract: A rectangular bin body having a top wall, front and back walls, side walls and bottom wall with an inlet opening in the top wall and a discharge opening in the front wall at the juncture of the front wall with the bottom wall and one of the side walls. The discharge opening is aligned with an internal corner of the bin at the juncture of the back and bottom walls with the one side wall so that when the bin is tipped upwardly about a generally horizontal axis located to one side of the bin and inclined with respect to the back the one side wall, the internal corner is located at an elevation below the remainder of the interior of the bin. In this position of the bin, the side walls, the back wall and the bottom wall function as a hopper to direct the bin contents to the internal corner so that the entire contents of the bin can be emptied by directing a suction tube inwardly of the bin straight through the discharge opening and into the internal corner.

Abstract: A portable tank has a sloped bottom structure with a smooth internal bottom surface sloping along a single bend toward a bottom discharge opening in the bottom plate. The sloped bottom structure has upturned curved side portions merging with upwardly extending wall portions joining the vertical walls of the tank along a horizontal edge. The bottom structure is formed by forming a discharge opening in a flat bottom plate near one edge, forming a gap between the opening and the edge which diverges from the gap toward the edge, bending the sides of the plate upwardly, and bringing the side of the gap together to mate in a closed seam bowing the bottom of the plate outward at the opening to slope the bottom towards the discharge opening.

Abstract: A lid closure assembly for a bin having a top wall and a circular passage through the top wall, the lid assembly comprising a generally circular lid member having a central portion and cylindrical rim portion with an outer diameter less than that of the passage, an outwardly open annular retaining groove in the rim portion having an O-ring seal disposed in the groove, and coacting means on the lid member and on the top wall of the bin for retaining the lid within the passage when the cylindrical rim portion of the lid member extends downwardly into the passage compressing the O-ring to maintain a seal.