Abstract: This disclosure concerns an expendable core for molds such as die casting dies, which core has a central aperture which may be elongated. The outside of this core is provided with a plurality of parallel grooves across the elongated sides of the core parallel to the aperture. These grooves may have corresponding ribs in the central aperture. One and the common end of each of these grooves is provided with a bridging web integral with the core for reinforcing and strengthening the core. The opposite end of the core from these webs may be provided with a printout portion also integral with the core by which the core is supported in the mold or die.

Abstract: Metallic lead, lead compounds and plastic material are recovered from the remaining inert material in scrap storage batteries by crushing the scrap storage batteries, adding the crushed material to an aqueous suspension of magnetic granular material to separate the inert and plastic material from the metallic lead and lead compounds by suspending in an aqueous magnetic suspension the inert and plastic material but not the metallic lead and lead compounds in said suspension, separating the suspension from said metallic lead and lead compounds, magnetically separating the magnetic granular material from the inert and plastic material and then removing the plastic material from the inert material by floatation in an aqueous media.

Abstract: A light-weight lead-acid battery has been prepared which contains a novel light weight electrode assembly. The electrode assembly comprises a laminated electrode having at least three plies, the center ply being a conductive sheet and the outer two plies being sheets of porous, compressed and sintered homogeneous composite of synthetic fibers and lead oxide powder material.

Abstract: A lead acid storage battery is produced wherein the electrolyte is an immobilized paste. The immobilized electrolyte paste comprises 1.5 to 4 parts sulfuric acid having a specific gravity from 1.050 to 1.350 and 1 part organic microparticles being inert to sulfuric acid and having a particle diameter of 0.1 to 3 .mu..