Patent attributes
A polishing pad for a chemical mechanical polishing apparatus has a body with a polishing surface having a radius, a central region, and a peripheral region. The polishing surface has a plurality of main radial-line channels extending radially outwardly from the central region to the peripheral region, each main radial-line channel having an angled outer segment at the peripheral region that is directed at an angle relative to a radius of the polishing surface. The polishing surface also has a plurality of primary tributary radial-line channels that are each connected by an angled transition segment to a main radial-line channel, the tributary radial-line channels being spaced apart from the main radial-line channels. The polishing pad provides an improved distribution and flow of polishing slurry during a polishing process.
