Patent ID: 8287330

Claim:
A chemical mechanical polishing pad, comprising: a circular polishing layer that includes a polishing surface; and a solid window secured in the polishing layer, the solid window including a first thinned region defined by a recess on a bottom surface of the window, a first thick region surrounding the first thinned region, the first thick region not vertically extendable, a second thinned region surrounding the first thick region, wherein the second thin region comprises two parallel slots formed in a top surface of the window, the two parallel slots on opposite sides of the recess, the two slots extending primarily radially relative to a center of the circular polishing layer but in parallel, and a second thick region surrounding the second thinned region and abutting the polishing layer, the second thinned region defining one or more flexure mechanisms configured to make the first thinned region and the first thick region movable relative to the second thick region in a direction parallel or substantially parallel to the polishing surface.