Patent ID: 8858202

Claim:
A rotary diaphragm pump, comprising: at least one case having a first end, a second end opposite the first end, and a plurality of chambers surrounding an elliptical cavity, wherein the plurality of chambers comprises four chambers and each of the chambers includes an inlet port and an outlet port; a first end plate disposed upon the first end of the case; a second end plate disposed upon the second end of the case; an elliptical diaphragm frame disposed within the elliptical cavity of the case; a flexible, resilient diaphragm having the form of a closed band, the diaphragm being disposed about the diaphragm frame, the diaphragm sealing each of the chambers from one another and from the elliptical cavity; and a rotary mechanism disposed within the elliptical cavity of the case, the mechanism selectively rotating within the case and periodically distending the diaphragm into each of the chambers of the case, thereby producing a pumping action.