Patent ID: 9238254
Filing Date: 2016-01-19
CPC Classification: B07B

Claim Text:
1. A disc for use in a disc screen, the disc having a longitudinal axis, the disc comprising: a body extending a length along the longitudinal axis; the body comprising a first major axis and a first minor axis, as defined by a first cross section taken perpendicular to the longitudinal axis at a first position along the length, the first major axis defining a first outer peripheral ridge with a diameter as defined by the distance from the first outer peripheral ridge to the center of the body, and the first major axis is substantially horizontal; the body comprising a second major axis and a second minor axis, as defined by a second cross section taken perpendicular to the longitudinal axis at a second position along the length, the second major axis defining a second outer peripheral ridge, wherein the second major axis is not substantially horizontal; a helical ridge in the direction of the longitudinal axis formed by a substantially continuous and non-stepwise surface between the first and second outer peripheral ridges, wherein the helical ridge substantially maintains the diameter between the first and second outer peripheral ridges.