End ported roller pump

Claim 1

A FLUID PUMP COMPRISING: (A) A HOUSING HAVING A CYLINDRICAL PUMPING CHAMBER THEREIN, (B) SAID PUMPING CHAMBER BEING DEFINED BY AN INNER CIRCUMFERENTIAL WALL AND A PAIR OF SPEACED CIRCULAR END WALLS; (C) A ROTOR ROTATABLY MOUNTED WITHIN SAID PUMPING CHAMBER AND HAVING ITS AXIS IN OFFSET PARALLEL RELATION TO THAT OF SAID PUMPING CHAMBER AND HAVING A WIDTH SUCH AS TO EXTEND FROM ONE OF SAID CIRCULAR END WALLS TO THE OTHER, (D) SAID ROTOR HAVING A PLURALITY OF ROLLER RECEIVING SLOTS HAVING A LEADING FACE AND A TRAILING FACE CONFRONTING ONE ANOTHER IN SPACED PARALLEL RELATION FORMED INTO AND EXTENDING THROUGHOUT THE ENTIRE WIDTH OF SAID ROTOR; (E) A ROLLER DISPOSED FOR FREE ROTATION IN EACH OF SAID SLOTS EXTENDING FROM ONE OF SAID CIRCULAR END WALLS TO THE OTHER AND HAVING A DIAMETER SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN SAID PARALLEL LEADING AND TRAILING FACES SO THAT THERE IS AN EFFECTIVE SEALING CLEARANCE WITH SAID FACES AT ALL TIMES; (F) THE RADIAL DEPTH OF SAID SLOTS BEING SUBSTANTIALLY GREATER THAN THE DIAMETER OF SAID ROLLERS SO THAT A SUBSTANTIAL CLEARANCE FORMING AN EFFECTIVE FLUID RESERVOIR WILL CONTINUALLY BE MAINTAINED INWARDLY OF EACH ROLLER EVEN WHEN EACH OF SAID ROLLERS IS IN ITS INWARDMOST POSITION; (G) A GENERALLY ARCUATE INLET PORT FORMED THROUGH ONE OF SAID CIRCULAR END WALLS, AND (H) A GENERALLY ARCUATE OUTLET PORT FORMED THROUGH THE SAME CIRCULAR END WALL, SAID ARCUATE INLET AND OUTLET PORTS BEING DIAMETRICALLY OPPOSED AND POSITIONED SO AS TO COMMUNICATE WITH SAID SLOTS DURING ROTATION OF SAID ROTOR.