Patent ID: 9097987
Filing Date: 2015-08-04
Classification: G03F

Abstract:
1. A lithographic projection apparatus comprising: a substrate table by which a substrate is held; a projection system by which a patterned beam is projected onto a target portion of the substrate, liquid being provided to a space between the projection system and the substrate and being confined in said space by a seal member; and a member having a first side and a second side opposite from the first side, the member being removably positionable adjacent to the projection system between the projection system and the substrate table so that the first side faces the projection system and the second side faces the substrate table to isolate the space provided with the liquid which contacts the first side of the member from a second space located on the second side of the member, wherein the member is separable from the substrate table and the projection system, and wherein the member is positionable on the substrate table so that the first side is substantially coplanar with a top surface of the substrate table that receives the substrate, wherein, in use, the liquid is at least partly recovered from underneath the seal member through a surface of the seal member that faces the substrate, or the top surface of the substrate table or both.