US Patent 11179965 Electrostatic chuck optimized for refurbishment

An electrostatic chuck includes a metal base plate, an electrostatic puck bonded to the metal base plate, and surface features on the surface of the electrostatic puck. The electrostatic puck includes an electrode embedded in the electrostatic puck. A surface of the electrostatic puck has a flatness of below 10 microns. The surface features include mesas and a sealing band around a perimeter of the electrostatic puck. The surface features have an average surface roughness of approximately 2-6 micro-inches. The corners of the surface features are not rounded.