Patent ID: 8216494

Claim:
A method for making a mold, the method comprising: providing a substrate and a retaining member, the retaining member comprising an inner space, and a first opening and an opposite second opening both communicating with the inner space, wherein a recess is formed in an inner wall of the retaining member, and a rubber ring is received in the recess; engaging the substrate with the retaining member, so that the substrate is steadily retained by the rubber ring and the recess; disposing viscous liquid polydimethyl siloxane containing material on the substrate in the inner space via the first opening; rotating the retaining member and the substrate to cause the polydimethyl siloxane containing material to spread out on the substrate and form a polydimethyl siloxane containing layer; press-molding the polydimethyl siloxane containing layer using a stamper to form one or more molding portions on the polydimethyl siloxane containing layer; solidifying the polydimethyl siloxane containing layer with the one or more molding portions; separating the stamper from the polydimethyl siloxane containing layer; and separating the substrate from the retaining member by pulling the substrate through the second opening to obtain a mold comprising the substrate and the polydimethyl siloxane containing layer with the one or more molding portions.