Patent ID: 7156641

Claim:
A mold for forming a contact lens from a reactive mixture, the mold comprising: a) a first mold portion comprising a concave optical surface, an edge, a first flange extending from the edge, and a protrusion extending from the first flange and being located about 1.0 mm to about 1.5 mm from the edge, wherein the protrusion is not present around the entire circumference of the first flange; b) a second mold portion comprising a convex surface and a second flange opposing the first flange; c) a reactive mixture overflow collector created between the first flange and the second flange when the second mold portion contacts the edge of the first mold portion, the reactive mixture overflow collector defined by: i) a first closed side extending from the edge along the first flange and including a surface of the protrusion exposed to reactive mixture overflow; ii) a second closed side extending from the edge to the second flange, and along a portion of the second flange opposing the protrusion; and iii) an open side situated between the first and second closed sides that is open to an ambient or inert environment, wherein the second closed side has a surface area for contacting reactive mixture overflow that is greater than or equal to that of the first closed side.