Pump priming

Claim 1

IN COMBINATION, A TANK ARRANGED TO RECEIVE LIQUID HAVING BOTTOM, SIDE AND TOP WALL PORTIONS, PUMP MEANS FOR REMOVING LIQUID FROM SAID TANK, SAID PUMP MEANS BEING LOCATED CLOSELY ADJACENT THE TOP WALL OF SAID TANK AND INCLUDING; A CASING, AN IMPELLER, AND AN INLET AND A DISCHARGE; VERTICALLY DISPOSED ELONGATED CONDUIT MEANS CONNECTED AT ITS UPPER END TO THE INLET OF SAID PUMP MEANS AND EXTENDING DOWNWARDLY THEREFROM TO TERMINATE AT ITS LOWER END AT A LEVEL CLOSELY ADJACENT THE TANK BOTTOM WALL PORTION, CONTROL MEANS FOR STARTING THE OPERATION OF SAID PUMP MEANS WHEN THE LEVEL OF THE LIQUID IN SAID TANK REACHES A PREDETERMINED UPPER LIMIT SUBSTANTIALLY EQUAL TO THE LEVEL OF THE TOP OF THE PUMP MEANS CASING AND FOR STOPPING THE OPERATION OF SAID PUMP MEANS WHEN THE LEVEL OF THE LIQUID IN THE TANK REACHES A PREDETERMINED LOWER LIMIT EQUAL TO OR SLIGHTLY ABOVE THE LOWER END OF SAID CONDUIT MEANS, AND VENT MEANS FORMED IN AN UPPER WALL PORTION OF SAID PUMP MEANS CASING FOR VENTING AIR TRAPPED WITHIN SAID PUMP MEANS AND CONDUIT MEANS AS THE LIQUID WITHIN SAID TANK RISES FROM THE LOWER PREDETERMINED LEVEL TO THE UPPER PREDETERMINED LEVEL TO ASSURE PRIMING OF SAID PUMP MEANS UPON STARTING THEREOF.