Fuente: WIPO "rice" 124,903. Rice, F. O. April 9, 1918. By aerating ascending column. -In a Pahle air lift of the type used for raising acid liquids, and having a side branch 2 through which the liquid descends, the air is supplied by a duct 5 made integral with the lift. An annular shelf 8 is provided at some distance below the top of the main pipe to facilitate the construction of a joint between the shelf and the uptake pipe, and to withstand internal pressure,