US Patent 7866379 Heat exchanger

A heat exchanger with reduced pressure loss, and improved productivity and strength. The heat exchanger is made by laminating first heat conduction plates and second heat conduction plates alternately. A first heat conduction plate and a second heat conduction plate are integrally molded of one sheet. The sheet includes air duct ribs, heat conduction planes, air duct end faces, first protrusions, first outer peripheral ribs, second outer peripheral ribs, air duct end covers, and second protrusions.