Pulp screen with discharge receptacle

Claim 1

A SCREEN SEPARATING MEANS FOR KNOTS AND FIBROUS PULP WHICH EMPLOYS A SPECIFIC GRAVITY DIFFERENCE BETWEEN THE KNOTS AND PULP TO CONCENTRATE THE KNOTS IN ONE REGION OF SAID SCREEN SEPARTING MEANS COMPRISING AN INTERMITTENTLY OPERABLE SUMP MEANS, SAID SUMP MEANS HAVING AN OPENING INTO SAID REGION OF SAID SEPARATING MEANS, SAID SUMP MEANS HAVING A SUBSTANTIAL EXTENT AWAY FROM SAID OPENING IN THE DIRECTION SAID KNOTS MOVE RELATIVE TO THE PULP, WHEREBY SAID KNOTS CAN PROCEED INTO SAID SUMP MEANS AND COLLECT THEREIN, AND BACK FLOW MEANS INCLUDING MEANS FOR SUPPLYING SUBSTANTIALLY PULP-FREE LIQUID HAVING A SPECIFIC GRAVITY DIFFERENT FROM SAID KNOTS IN THE DIRECTION OF SAID PULP, SAID FLOW MEANS OPERATING WHEN SAID SUMP MEANS IS IN COMMUNICATION WITH SAID REGION OF SAID SEPARATING MEANS, SAID BACK FLOW MEANS CONSTRUCTED AND ARRANGED TO INTRODUCE SAID LIQUID INTO THE PATH OF MOVEMENT OF SUBSTANTIALLY ALL OF SAID KNOTS IN A PART OF SAID SUMP MEANS NORMALLY CLOSED TO DISCHARGE, WHEREBY UNDER RELATIVELY QUIESCENT CONDITIONS SAID KNOTS CAN MOVE AWAY FROM SAID OPENING AND COLLECT IN SAID SUMP MEANS, AND SAID LIQUID CAM MOVE TOWARD SAID