Integral immersible filter and pump assembly

Claim 1

AN INTEGRAL IMMERSIBLE FILTER AND PUMP ASSEMBLY MAINTAINED IN A TANK AT A PREDETERMINED LEVEL, COMPRISING A TUBULAR FILTER, AN IMPERVIOUS TUBULAR CYLINDER EXTENDING CO-AXIALLY WITHIN AND SPACED FROM SAID FILTER, AN IMPERVIOUS TUBULAR CASING EXTENDING CO-AXIALLY WITH RESPECT TO SAID FILTER AND SPACED OUTWARD THEREFROM, TOP COVER MEANS HAVING A SUBSTANTIALLY CENTRALLY DISPOSED APERTURE IN ALIGNMENT WITH SAID CYLINDER, FIRST MEANS FOR SECURING SAID TOP COVER MEANS IN TIGHT SEALING ENGAGEMENT WITH THE TOP ENDS OF SAID FILTER, SAID CYLINDER AND SAID CASING, SAID TOP COVER MEANS INCLUDING OUTLET CHAMBER MEANS IN COMMUNICATION WITH THE SPACE BETWEEN THE INTERIOR OF SAID FILTER AND THE EXTERIOR OF SAID CYLINDER, BOTTOM COVER MEANS, SECOND MEANS FOR SECURING SAID BOTTOM COVER MEANS IN TIGHT SEALING ENGAGEMENT WITH THE BOTTOM ENDS OF SAID FILTER, SAID CYLINDER AND SAID CASING, SAID BOTTOM COVER MEANS INCLUDING A PUMPING CHAMBER HAVING DISCHARGE MEANS IN COMMINICATION WITH THE SPACE BETWEEN THE EXTERIOR OF SAID FILTER AND THE INTERIOR OF SAID CASING, A CENTRAL INLET OPENING IN SAID BOTTOM COVER MEANS AND IN COMMUNICATION WITH THE LIQUID IN SAID TANK SURROUNDING THE BOTTOM COVER MEANS AND WITH SAID PUMPING CHAMBER, A CENTRIFUGAL IMPELLER WITHIN SAID PUMPING CHAMBER FOR URGING THE LIQUID INTO SAID SPACE BETWEEN THE EXTERIOR OF SAID FILTER AND THE INTERIOR OF SAID CASTING, THENCE ACROSS THE WALL OF SAID FILTER, IN INWARD DIRECTION, AND THROUGH SAID OUTLET CHAMBER MEANS, DRIVE MEANS FOR ROTATING SAID IMPELLER AND INCLUDING A SHAFT EXTENDING THROUGH SAID