Aluminum-silicon alloy extruded pistons

Claim 1

A DUCTILE TRUNK-TYPE HIGH SILICON CONTENT ALUMINUM ALLOY PISTON CONTAINING AT LEAST 16% SILICON WHICH COMPRISES A HEAD PORTION, A RING FLANGE PORTION, OPPOSED WRISTPIN BOSS PORTIONS, AND A SKIRT PORTION, ALL OF SAID PORTIONS BEING INTEGRALLY CONNECTED AND EACH DISPLACED FROM A BLANK, SAID HEAD PORTION HAVING A CRYSTALLINE STRUCTURE WITH UNBROKEN SLIP PLANES CONTINUED FROM THE HEAD PORTION AND EXTENDING PARALLEL TO THE INNER AND OUTER FACES OF THE RING FLANGE, SAID BOSS PORTIONS HAVING A CRYSTALLINE STRUCTURE WITH UNBROKEN SLIP PLANES EXTENDING FROM THE HEAD PORTION AND BEING PARALLEL WITH THE INNER AND OUTER FACES OF THE BOS PORTION, SAID SKIRT PORTION HAVING A CRYSTALLINE STRUCTURE WITH UNBROKEN SLIP PLANES EXTENDED FROM THE RING FLANGE AND SUBSTANTIALLY PARALLEL WITH THE INNER AND OUTER FACES OF THE SKIRT PORTION, SAID RING FLANGE PORTION TERMINATING INTERMEDIATE THE ENDS OF THE WRISTPIN BOSSES AND BEING SUBSTANTIALLY THICKER THAN THE SKIRT PORTION AND THINNER THAN THE WRISTPIN BOSSES, SAID WRISTPIN BOSSES EXTENDING FROM THE HEAD PORTION AND BEING SUBSTANTIALLY THICKER THAN THE RING FLANGE AND SKIRT PORTIONS WITH THE OPPOSED INNER FACES THEREOF IN SUBSTANTIALLY PARALLEL RELATION, AND SAID RING FLANGE AND SKIRT HAVING SUBSTANTIALLY PARALLEL INNER AND OUTER FACES, WHEREBY UNBROKEN SLIP PLANES OF THE METAL EXTEND FROM THE HEAD THROUGH SECTIONS OF WIDELY VARYING THICKNESS TO THE EXTREMITY OF THE UNIFORMLY THIN PISTON SKIRT PORTION AND WHEREBY SAID SLIP PLANES ENHANCE THE DUCTILITY, STRENGTH AND WEAR RESISTANCE OF SAID ALLOY.