Patent ID: 8104619

Claim:
A wafer container comprising: a base having a major surface that includes a plurality of angular sectors; segmented inner walls formed of individual wall segments located on a respective first arc on the base and separated from an adjacent wall by a space in a radial direction along said major surface; segmented outer walls formed of individual wall segments located on a respective second arc on the base and separated from an adjacent wall by a space in a radial direction along said major surface, each of said outer walls being unconnected to the inner walls along the entire length of the inner walls, wherein between 0.1 and 25% of the arc length of said first arc is located in the same angular sectors as the arc length of said second arc; a slot in at least one of said outer walls that extends at least substantially along the entire height of said outer walls, and has a width dimension that is greater than the distance between an inner wall and an outer wall; and a cover that engages to the base to form a closed container.