US Patent 10019029 Multi-layer injection molded device housings

A housing for an electronic device includes a single rear housing assembly coupled to the cover glass of a display assembly. The rear housing assembly includes a metal rear chassis with two layers of injection molded material formed on at least the chassis side regions. The first injection molded layer includes a high reinforcing agent content percentage to provide increased stiffness, and the second injection molded layer includes a low reinforcing agent content percentage, which provides less structural support than the first injection molded layer, but an improved aesthetic appearance.