Patent ID: 6935220

Claim:
A piston for use in an engine or a compressor, comprising: (a) a piston crown, wherein the piston crown further comprises a plurality of grooves encircling the crown, and wherein at least one of the grooves further comprises a first plurality of bores, and wherein the bores pass completely through the body of the piston; (b) a piston skirt beneath the piston crown, wherein the piston skirt further comprises a plurality of vertical drainage furrows formed in a portion of the piston skirt; (c) at least one channel recessed into the piston body between the topmost portion of the piston skirt and the bottom-most of the grooves and running parallel to the bottom-most groove; and (d) a second plurality of bores passing completely through the body of the piston, wherein each of the second plurality of bores passes through a portion of the recessed channel and the portion of the skirt immediately adjacent to the recessed channel.