Patent ID: 6730444
Filing Date: 2004-05-04
Classification: G03F,H01L

Abstract:
A needle comb reticle pattern for use in process measurement during semiconductor substrate processing comprising:a box-in-box feature including a solid inner box having an outer periphery substantially defined by four substantially straight sides and an outer box frame having an inner periphery substantially defined by four inner substantially straight sides and an outer periphery substantially defined by four outer substantially straight sides; wherein the outer box frame surrounds the inner box and a gap separates the outer periphery of the inner box and inner periphery of the outer box frame; wherein the gap between the outer periphery of the inner box and the inner periphery of the outer box frame is substantially uniform along each side of the inner box and outer box frame; a first needle comb proximately flanking the outer periphery of a first side of the outer box frame; and a second needle comb proximately flanking the outer periphery of a second side of the outer box frame.