body includes a series of piston ring groove and piston ring lands one of which is modified to include drainage notches the skirt portion of the piston body includes a plurality of furrows near the face of the piston a horizontal channel recessed into the surface of the piston skirt and a horizontal groove formed in the outer skirt wall of the piston these structures function individually and in combination to provide multiple means by which excess lubricating oil may be directed away from the oil control rings and back toward the crankcase or oil reservoir within the engine or compressor application_number US 44889203 A description with reference to the figures an exemplary embodiment of the present invention provides a piston for use in compressors or in engines that includes features for reducing the hydrodynamic pressure experienced by certain piston components when the piston is in operation in general the present invention overcomes the problems created by excessive oil pressure build up at the oil control rings and on the piston skirt by providing a number of features including i drainage notches ii drainage furrows iii drainage bores iv channel s and v groove s if lubricating oil begins to accumulate beneath and or behind the piston rings these various features function separately or together to reduce any resulting excessive oil pressure by directing the oil away from the piston rings and back toward the crankcase as shown in fig1 piston body 10 includes a piston crown 12 and a contoured piston skirt 34 piston crown 12 further includes a series of piston rings piston grooves and piston lands situated between the piston rings more specifically as best shown in fig1 and 5 piston crown 12 includes a first piston ring groove 14 a first.