Apparatus for the preparation of clear solutions

Claim 1

A FLUID-TIGHT APPARATUS FOR THE REPEATED FILTRATION OF LIQUIDS TO REMOVE CONTAMINANTS THEREFROM WHICH COMPRISES: TWO OPEN MOUTH FLASKS, SAID FLASKS COMPRISING A FIRST FLASK CONTAINING LIQUID TO BE FILTERED AND A SECOND FLASK ADDAPTED TO RECEIVE SAID LIQUI AFTER IT HAS BEEN FILTERED; A COVER SEATED ON THE MOUTH OF EACH FLASK TO FORM AN AIR TIGHT JOINT: MEANS INCLUDING TWO CONDUITS CONNECTING THE LOWER PORTIONS OF SAID TWO FLASKS TO ONE ANOTHER; AT LEAST ONE FILTER AND ONE CHECK VALVE IN EACH OF SAID TWO CONDUITS DISPOSED SO THAT THE PASSAGE OF LIQUID FROM THE FIRST FLASK TO THE SECOND FLASK IS PERMITTED IN THE FIRST OF SAID CONDUITS WHILE IT IS PREVENTED IN THE REVERSE DIRECTION AND THE PASSAGE OF LIQUID FROM THE SECOND FLASK TO THE FIRST FLASK IS PERMITTED IN THE SECOND OF SAID CONDUITS WHILE IT IS PREVENTED IN THE REVERSE DIRECTION; TWO SOURCES OF GAS UNDER PRESSURE, THE FIRST OFF SAID SOURCES OF GAS BEING AT A PRESSURE GREATER THAN THE SECOND OF SAID SOURCES OF GAS; A THIRD CONDUIT MEANS CONNECTING THE UPPER PORTIONS OF SAID TWO FLASKS WITH SAID TWO SOURCES OF GAS UNDER PRESSURE; A VALVE IN SAID THIRD CONDUIT, SAID VALVE HAVING TWO SEPARATE AND DISTINCT PASSAGES THEREIN; SAID VALVE BEING MOVABLE TO A FIRST POSITION WHEREIN THE FIRST OF SAID PASSAGE IN SAID VALVE CONNECTS THE FIRST OF SAID FLASKS TO THE SOURCE OF HIGHER GAS PRESSURE AND THE SECOND OF SAID PASSAGES IN SAID VALVE CONNECTS THE SECOND OF SAID FLAKS TO THE SOURCE OF LOWER PRESSURE GAS WHEREBY THE LIQUID CONTAINED INSAID FIRST FLASK IS TRANSFERED THROUGH THE FIRST CONDUIT AND THE FILTER THEREIN AND INTO TTHE SECOND FLASK, AND SAID VALVE BEING MOVABLE TO A SECOND POSITION WHEREIN HE FIRST OF SAID PASSAGES IN SAID VALVE CONNECTS THE SECOND OF SAID FLASKS WITH THE SOURCE OF HIGHER PRESSURE GAS AND THE SECOND OF SAID PASSAGES IN SAID VALVE CONNECTS THE FIRST OF SAID FLASKS WITH THE SOURCE OF LOWER PRESSURE GAS WHEREBY THE LIQUID IS CAUSED TO BE RETURNED FROM THE SECOND FLASK TO THE FIRST IN WHICH IT WAS ORIGINALLY PRESENT BY PASSAGE TROUGH SAID SECOND CONDUIT AND THE FILTER THEREIN AND MEANS TO ACTUATE SAID VALVE AFTER EACH TRANSFER IS COMPLETED BETWEEN SAID FIRST AND SAID SECOND POSITIONS WHEREBY SAID LIQUID IS REPEATEDLY FILTERED ON PASSAGES ALTERNATELY THROUGH SAID FIRST AND SECOND CONDUITS AND THE FILTERS THEREIN.