Patent ID: 7197852

Claim:
A composite panel comprising: a first face sheet; a second face sheet offset from the first face sheet; a stiffener disposed between the first and second face sheets, the stiffener having a first attachment portion attached to the first face sheet, a second attachment portion attached to the second face sheet, and an intermediate portion extending between the first and second attachment portions; a first core portion positioned between the first and second face sheets on a first side of the stiffener, wherein at least a first portion of the stiffener is bonded to the first core portion; and a second core portion positioned between the first and second face sheets on a second side of the stiffener opposite to the first side of the stiffener, wherein at least a second portion of the stiffener is bonded to the second core portion, and wherein the stiffener defines an open passageway extending between the first and second core portions.