US Patent 7617644 Drain and a building structure having a drain

A floor drain with a bottom part having at least one discharge opening, a front part that is integral with the bottom part and which has a first part inclined to the bottom part at an angle of at least 30°, and a flange part that is horizontal or inclined to horizontal at an angle of less than 20°, two side walls integral with the bottom part and first part, and a back part that is integral with the bottom part. The back part extends vertically from the bottom part, through and above the plane defined by the flange part.