Patent ID: 7282112

Claim:
An improved baffle plate in a plasma processing system comprising: a ring comprising an upper surface, a lower surface, an inner radial edge coupled to said upper surface and said lower surface, an outer radial edge coupled to said upper surface and said lower surface, and at least one passageway coupled to said upper surface and to said lower surface and configured to permit the flow of a gas therethrough, wherein said upper surface comprises a first mating surface proximate said outer radial edge, said lower surface comprises a second mating surface proximate said outer radial edge and a plurality of fastener mating surfaces proximate said inner radial edge, and each of said at least one passageway comprises an internal passageway surface, wherein said second mating surface comprises: an outer edge mating surface extending radially inward from said outer radial edge; and a recessed mating surface recessed from the outer edge mating surface, and wherein said ring further comprises at least one of a plurality of fastening receptors and a plurality of mounting through-holes coupled to said upper surface and said lower surface of said baffle plate and configured to receive fastening devices in order to couple said baffle plate to said plasma processing system.