Patent ID: 7527485

Claim:
An apparatus comprising: a housing; three geometrical elements, the three geometrical elements and the housing form a first chamber, the three geometrical elements are configured for synchronized rotation and a continuous portion of the first chamber, defined by the three geometrical elements, permits a volume of the first chamber to be varied; wherein the volume of the first chamber is a function of rotation of the three geometrical elements; and three additional geometrical elements, the three additional geometrical elements are configured with the three geometrical elements to form a second chamber, a third chamber, a fourth chamber, a fifth chamber, a sixth chamber, a seventh, and an eight chamber, wherein each of the geometrical elements contributes to forming a part of four chambers; wherein a first common geometrical element, which is one of the three geometrical elements, contributes to forming a first set of four of the eight chambers and a second common geometrical element, which is one of the three additional geometrical elements, contributes to forming a second set of four of the eight chambers.